Swatches are used to display the selection of options, for any type of product(simple, configurable) rather than choosing a custom option from a drop-down list. It is the easy way for customer to make their selection by showing how a product looks in different attributes(color, size, design…). Swatches changes the product image according to the swatch you have selected. It shows the product more presentable, attractive and informative.
Magento Editions Compatibility:
Magento Community 1.7.x, 1.8.x, 1.9.x