In computing, a plug-in (or plugin) is a set of software components that add specific abilities to a larger software application (Wikipedia).

Plugins are used to extend the functionality of nopCommerce. nopCommerce has several types of plugins. For example, payment methods (such as PayPal), tax providers, shipping method computation methods (such as UPS, USP, FedEx), widgets (such as 'live chat' block), and many others.