WordPress plugins are pieces of software that can be installed on a WordPress website to add new features or functionality. These plugins are typically developed by third-party developers, and can be downloaded and installed directly from the WordPress plugin repository, or from other sources.
Plugins can be used to add a wide variety of functionality to a WordPress website, including social media integration, e-commerce features, search engine optimization tools, and much more. Some plugins are free, while others require a one-time or recurring fee to use