WordPress Plugin is a part of software that contains a set of function that can be added to WordPress website. It is used to add on new features or to increase its functionality. This plugin is written in the PHP programming language. We can call it as a building block of WordPress. Whether you need to improve SEO, add contact forms or want to create a digital store. Whatever functionality you want to add on your WordPress site they can be done with the help of plugin only.
For example, if you want to play an informative video on your website. you need a plugin to play it. Some of the examples of WordPress plugin are Yoast SEO, Wp auto terms etc.