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, , etc.) the page contains. While the number of DOM nodes doesn’t affect network performance, it does affect browser performance. A browser will take a longer time to parse, process, and render a page if it has more nodes.

E Cube Routing method that employs xy- routing algorithm . This is commonly referred to as Deterministic, Dimension ordered Routing model. Ecube routing works by traversing the network in the Kth dimension where K is the least significant Non Zero bit in the result of calculating distance.

End to End page load performance measures the performance of a page from the initial request for the base HTML document to the loading and render of the final asset, including any assets that are delivered late or lazy loaded such as 3rd party marketing tags. As such it’s a useful number to know, but not indicative of real user experience.

In computer programming, eager evaluation, also known as strict evaluation or greedy evaluation, is the evaluation strategy used by most traditional programming languages. In eager evaluation, an expression is evaluated as soon as it is bound to a variable.

Ecommerce optimization is defined as a system-wide improvement of your ecommerce store so that all focus is put into the facilitation of greater and faster sales. The average ecommerce conversion rate falls between 1% and 3% on a global scale.

Edge computing is a networking philosophy that aims to bring computing as close as possible to the database to decrease latency and bandwidth use. Simply put, edge computing implies operating fewer cloud processes and transferring those processes to local locations, such as a user\'s desktop, an IoT device, or an edge server.

An editorial link is a link that results from a site having good content and marketing techniques. An editorial link is not paid for or directly requested, as is the case with acquired links. Editorial links are part of a strong link profile.

Effect size is the magnitude of the difference between a hypothesized and an observed value of a parameter. The parameter is usually an unknown variable theta (θ) and can be either a primary KPI or secondary KPI.

Effective bandwidth is the frequency interval where the start and end frequencies correspond to the half of the particle velocity at the design frequency (3dB bandwidth).the effective bandwidths can be found by an analytical expression. In many situations, however, the effective bandwidth has to be determined by estimation from traffic data.

Elapsed time is measured by the time from the first moment of sending the data and the time of the last byte of the received response. Elapsed time – Latency time = Download Time

Elastic block flash (EBF) is a scalable storage solution designed for high availability and reliability. The use of flash storage allows elastic block flash to function as a storage array with enhanced read/write performance capability. Elastic block flash is used in super converged networks to provide fast I/O storage action for cloud computing environments.

An elastic layout is one that uses percentages and ems for widths paired with a max-width style to allow the site layout to stretch when font sizes are changed. It’s ability to flex to accommodate the browser width and reader’s font preferences are where it gets its name.

Elasticsearch is a search engine based on the Lucene library. It provides a distributed, multitenant-capable full-text search engine with an HTTP web interface and schema-free JSON documents. Elasticsearch is developed in Java.

Electrically Erasable Programmable Read-Only Memory (EEPROM) is a stable, non-volatile memory storage system that is used for storing minimal data quantities in computer and electronic systems and devices, such as circuit boards. This data may be stored, even without a permanent power source, as device configuration or calibration tables.If storing higher volumes of data that is static (like in USB drives), certain types of EEPROM (like flash memory) are more cost-effective than conventional EEPROM devices.

In XML, an element is the central building block of any document. Individual elements can contain text, other elements, or both.

Element list is a report type under website heatmaps that shows the list of elements on a page sorted by its relative importance in terms of clicks it has received.

EM is a unit of measurement for sizing fonts and other elements within a web page relative to the item’s parent element. A 1em font is equal to the point size for the font already defined in the parent element (2em would be twice the current size; .5em would be half the current size).

Email A/B Testing consists of applying principles of A/B testing two versions of a web page, to two versions of an email campaign. One might change the headline, content, layout, CTA, or any other number of elements to decide which performs best in terms of KPIs like open or click rate.

Embedded analytics is the process of embedding analytics and reporting capabilities within a device or information system. It provides data and process analysis capabilities natively into the underlying information system. It is generally embedded with transactional process systems and applications.

Embedded database system is a database management system. Which is tightly integrated with an application software that requires access to stored data, such that the database system is “hidden” from the applications end user and requires little or no ongoing maintenance.

Embedded software is a piece of software that is embedded in hardware or non-PC devices. It is written specifically for the particular hardware that it runs on and usually has processing and memory constraints because of the device’s limited computing capabilities. Examples of embedded software include those found in dedicated GPS devices, factory robots, some calculators and even modern smartwatches.

Embedded SQL is a method of inserting inline SQL statements or queries into the code of a programming language, which is known as a host language. Because the host language cannot parse SQL, the inserted SQL is parsed by an embedded SQL preprocessor. Embedded SQL is a robust and convenient method of combining the computing power of a programming language with SQL\'s specialized data management and manipulation capabilities.

An embedded style is a CSS style written into the head of an XHTML document. It only affects the elements on that page, instead of site-wide as a separate CSS file does. Style in an embedded style sheet will override styles from the linked CSS file.

Coupled Logic:In electronics, emitter-coupled logic is a high-speed integrated circuit bipolar transistor logic family. ECL uses an overdriven BJT differential amplifier with single-ended input and limited emitter current to avoid the saturated region of operation and its slow turn-off behavior.

Encrypted file transfer is the process of encrypting a file before transmitting it over a network, Internet and/or remote server. It is done to secure a file and hide its content from being viewed or extracted by anyone except the receiver or sender.

Endpoint authentication is an authentication mechanism used to verify the identity of a network\'s external or remote connecting device. This method ensures that only valid or authorized endpoint devices are connected to a network. These endpoint devices include laptops, smartphones, tablets and servers.

Endurance Testing is a type of performance test that verifies a system’s stability and performance characteristics over an extended period of time. It is typical in this type of performance test to maintain a certain level of user concurrency for an extended period of time. This type of test can identify issues relating to memory allocation, log file handles, and database resource utilization. Endurance testing is a subset of load testing. An endurance test is a type of performance test focused on determining or validating the performance characteristics of the product under test when subjected to workload. The execution time duration can be set in the schedule section in JMeter thread groups.

As a website owner, you should be familiar with the concept of analytics. Through your analytics package you can determine bounce rates for your landing pages and keywords, visit duration, and page views plus many other things.Engagement metrics automates this process. They allow you to see what is engaging your users by utilizing a composite engagement index.

Enhanced Ecommerce Reports (EER) is a feature available in the Universal Analytics version of Google Analytics. EER allows for using GA to track many more features than just regular Ecommerce reports, including the ability to measure refunds. By using EER you can gain a more accurate understanding of how your company is doing precisely

An optimization to a guest operating system to make it aware of virtual machine environments and tune its behavior for virtual machines.

Ensemble programming refers to the programming techniques and tools which are used for an integrated application development that is capable of transcending various interfaces and devices. It combines the advanced technologies of mobile application development (AD) and Web development to create user interfaces that can provide a seamless and high-quality user experience that is not limited to a single device. Designers employ various techniques and tools to make ensemble programming work and must take into consideration the various factors involved for providing such a uniform user experience.

Enterprise application integration (EAI) is the use of technologies and services across an enterprise to enable the integration of software applications and hardware systems. Many proprietary and open projects provide EAI solution support. EAI is related to middleware technologies. Other developing EAI technologies involve Web service integration, service-oriented architecture, content integration and business processes.

Enterprise Feedback Management (EFM) is an enterprise-wide and centrally panel managed system of processes and survey software that facilitates data collection, authoring, statistical analysis and reporting. EFM involves a workflow process ensuring quality surveys consistently administered with assured privacy through IT security policies. EFM’s purpose is to facilitate communication and dialog between the enterprise and employees, customers, and business partners to address key issues and concerns. Potentially, this can make possible real time customer interventions.

Enterprise resource planning (ERP) is a method of efficiently utilizing people, hardware and software to increase productivity and profit, thus simplifying a company’s business processes. ERP may include many software applications or a single (but more complex) software package that smoothly disseminates data required by two or more unique business departments.

The first page that a visitor arrives at on a website from another domain.

Enumeration sort is a method of arranging all the elements in a list by finding the final position of each element in a sorted list. It is done by comparing each element with all other elements and finding the number of elements having smaller value

Environment variables are values that impact the processes and behavior of running computer systems and OS environments. Running programs may access environment variable values for configuration purposes.

Explicitly Parallel Instruction Computing is a 64-bit microprocessor instruction set, jointly defined and designed by Hewlett Packard and Intel, that provides up to 128 general and floating point unit registers and uses speculative loading, predication, and explicit parallelism to accomplish its computing tasks.

Equipment footprint refers to the physical space a computing device or equipment requires when being placed or deployed within a home, office or computing facility. It is generally equated in terms of size in square feet / meters of area that the device will consume in a physical location and its impact on the overall space.

Equivalence partitioning (EP) is a method for testing software programs. In this technique, the data fed into the software to be tested is divided into partitions of equal sizes. From each partition of data, one test case is needed. The different test cases must test the classes of the software continuously. This helps in the discovery of errors and bugs which may plague the software. Each test case is defined specifically to check a specific type of error. This speeds up the error hunting process as fewer test cases are required. Equivalence partitioning is also known as equivalence class partitioning (ECP).

Error correction code (ECC) checks read or transmitted data for errors and correct them as soon as they are found. ECC is similar to parity checking except that it corrects errors immediately upon detection. ECC is becoming more common in the field of data storage and network transmission hardware, especially with the increase of data rates and corresponding errors.

In statistics, an error probability is the frequency with which a certain probabilistic testing procedure will lead to a type I error or a type II error. In other words, it is the rate of occurrence of an error in a hypothetical infinite repetition of the procedure.

The error rate is a calculation that measures the percentage of problem requests (errors) compared to all requests. Error rates should be measured with different loads. An acceptable error rate may differ from company to company, but this metric helps businesses and IT managers understand pinpoint when the application will fail.

An error-spending function is a function that governs the cumulative type I or type II error that is \"spent\" at each analysis time during a sequential testing online experiment. A function that governs the rate at which the type I error (alpha) is spent is called and Alpha-Spending while one which controls the rate at which the type II error (beta) is spent is called Beta-Spending.

End System-to-Intermediate System is a routing protocol developed by the international organization for Standardization as part of their Open Systems interconnections model. In the OSI Context, an end system is a node or user device. ES-IS allows a node or user device located in a particular subnetwork to determine the existence and availability of other nodes or user devices on the same subnetwork

In C#, an escape sequence refers to a combination of characters beginning with a backslash (\\) followed by letters or digits. Escape sequences represent non-printable and special characters in character and literal strings. As such, they allow users to communicate with a display device or printer by sending non-graphical control characters to specify actions like question marks and carriage returns. An escape sequence is used when writing sections of code, like preprocessor definitions, to specify continuation characters, so that multiple lines of code are considered as a single line by the compiler. Regular expressions that help perform sophisticated string search operations use escape sequences to locate substrings within a large string. By enabling quoted strings, escape sequences may be used to create output files containing text template tags and files.

Ethernet is the traditional technology for connecting wired local area networks (LANs), enabling devices to communicate with each other via a protocol -- a set of rules or common network language. An Ethernet cable is the physical, encased wiring over which the data travels.

An ethical worm is a type of software that is replicated and sent to various systems over the Internet, in order to fix security vulnerabilities or provide security patches. Companies may offer an ethical worm in order to promote speedier universal closure of some kind of security loophole, when individual system administrators may not act quickly enough to protect their systems against a threat.

“ETL” – Extract, Transform, Load – describes a process in which data is extracted from one system, transformed and loaded into another system. In the context of Process Mining, data is first extracted, then transformed, and then loaded into a Process Mining tool.

Events are listed together with their attributes in an event log. Attributes that are typically listed are the case ID, the timestamps of the start and end times, and other attributes of the event recorded by the IT system. An event log thus represents one or more cases of a business process. An event log can also be the documentation of several related business processes.

An event queue is a repository where events from an application are held prior to being processed by a receiving program or system. Event queues are often used in the context of an enterprise messaging system.

Event tracking is a method that is available in Google Analytics. It lets you record user interactions with various web elements like a menu system driven by Flash. You can do this by attaching a piece of code to an element in the website.

Events per second (EPS) is a term used in IT management to define the number of events or processes that take place in a given time on any IT appliance. EPS is a method to review and evaluate the usability statistics of a hardware device, software application, network medium or hardware, Internet application, and/or a security device/appliance.

Eventual consistency is a consistency model used in distributed computing to achieve high availability that informally guarantees that, if no new updates are made to a given data item, eventually all accesses to that item will return the last updated value

An executable refers to a file containing instructions and data meant for performing a sequence of tasks on a computer. The contents of the executable file must be interpreted by an operating system to a meaningful machine code instructions to be used by physical central processing unit (CPU). An executable can also be a file comprised of commands for a software compiler to execute. Even a VB or Java script or any other script language source file may also be considered an executable.

An execute disable bit is an Intel hardware-based security component used in the central processing unit (CPU) to separate areas of a memory as storage of processor instructions or as storage of data. EDB classifies areas in memory where a code can execute or not execute. It is a basic input/output system (BIOS) feature, which if enabled reduces a computer system, or a server’s, vulnerability to viruses and malicious code attacks. Thus, EDB prevents these harmful viruses and malicious software from executing and spreading on a server or network. EDB is also abbreviated as XDB. Intel markets EDB feature as XD bit. The EDB feature is only available in the most-up-to-date versions of Intel processors, but not all operating systems (OSs) support it. This term is also known as NX-bit, the name used by Advanced Micro Devices (AMD).

Run and monitor your tests. Validate the tests, test data, and results collection. Execute validated tests for analysis while monitoring the test and the test environment.

Execution in computer and software engineering is the process by which a computer or virtual machine executes the instructions of a computer program. ... In this case, the \"commands\" are simply program instructions, whose execution is chained together. The term run is used almost synonymously.

An exit code or exit status is a number that is returned by an executable to show whether it was successful. This is also sometimes called a return code, or in some cases, an error code, although the terminology here may be slightly different.

The last page that a visitor accesses during a visit before leaving a website.

Exit pop-up is a pop-up that is displayed on the screens of website visitors as soon as they show an intent to leave the website. Exit pop-ups generally carry some sort of incentive for visitors, encouraging them to engage more with the website.

Sometimes confused with bounce rate. Exit rate is a digital marketing term used to indicate the percentage of visitors to a site who actively click away to a different site from a specific page. These visitors may have visited other pages on the site prior to exiting, which distinguishes them from ‘bounced’ visitors.

Exit survey is a small set of questions that ask visitors about their website experience when they try to leave the website.

In performance Optimization a vector computer instruction that stores the elements of a vector according to the values in a corresponding masking vector

An expanded memory specification (EMS) was a technique introduced in about 1984 for expanding the conventional or main memory beyond 1 MB in IBM XT compatible computers. The process was known as bank switching and involved expanding memory beyond that which was directly addressed by the processor. EMS was designed for disk operating system (DOS) software programs requiring the additional memory. EMS is also known as expanded memory, LIM EMS, LIM 4.0 or EMS 4.0.

In computer science, the space complexity of an algorithm or a computer program is the amount of memory space required to solve an instance of the computational problem as a function of the size of the input. It is the memory required by an algorithm to execute a program and produce output.

Intuitively, Average Time Complexity refers to the typical behavior of the algorithm, averaged over all possible inputs. Expected Time Complexity refers to typical behavior of the algorithm, given an adversarial input distribution.If we take the worst-case in both, we get \"Worst-Case Time Complexity\".

Experience optimization is the process of testing and optimizing a website so that visitors get the best possible experience across all touchpoints throughout the website journey.

Exploratory stress testing is an approach to subjecting a system, application, or component to a set of unusual parameters or conditions that are unlikely to occur in the real world but are nevertheless possible. In general, exploratory testing can be viewed as an interactive process of simultaneous learning, test design, and test execution. Most often, exploratory stress tests are designed by modifying existing tests and/or working with application/system administrators to create unlikely but possible conditions in the system. This type of stress testing is seldom conducted in isolation because it is typically conducted to determine if more systematic stress testing is called for related to a particular failure mode.

Extended system configuration data (ESCD) is a portion of the nonvolatile basic input/output system (BIOS) memory (also known as complementary metal-oxide-semiconductor (CMOS) memory) on a personal computer motherboard. This is also where the ISA PnP device data is located. ESCD is employed by the BIOS to assign resources for hardware extensions, commonly called expansion cards.

Extensible Authentication Protocol (EAP) is a point-to-point (P2P) wireless and local area network (LAN) data communication framework providing a variety of authentication mechanisms. EAP is used to authenticate simple dialup and LAN connections. Its major scope is wireless network communication such as access points used to authenticate client-wireless/LAN network systems.

Extensible Markup Language (XML) is a universal format, maintained by the W3C, used for representation and transfer of structured data on the web or between different applications.

Extensible Metadata Platform (XMP) is an ISO standard, originally created by Adobe Systems Inc. for the creation, processing and interchange of standardized and custom metadata for digital documents and data sets.

An external cache is any cache memory or type of central processing unit (CPU) cache that is housed, placed or installed external to a computer processor. It provides high speed data storage and processing services to the computer processor, its primary/native cache and the main memory. External cache is also known as secondary cache.

The Exterior Gateway Protocol is a routing protocol for the Internet originally specified in 1982 by Eric C. Rosen of Bolt, Beranek and Newman, and David L. Mills. Exterior Gateway Protocol is a protocol for exchanging routing information between two neighbor gateway hosts in a network of autonomous systems.

This is a CSS document that is written in a separate, external document. The biggest advantage to using an external style sheet is that it can be linked to by multiple HTML/XHTML files (which means changes made to the style sheet will affect all the pages linked to it without having to change each page individually).

Extreme Programming (XP) is an intense, disciplined and agile software development methodology focusing on coding within each software development life cycle (SDLC) stage.

Eye flow is the study of visitors’ eye movements while browsing a website. Eye flow helps to track areas that visitors view or discard the most.

Eyetracking is a form of website testing that follows eye movements of experiments\' participants to gauge how they interact with web pages. This provides insight into the most important real estate on your pages.