Definition: Plugins are parts, pieces, or components used to make a larger object. They can be hardware, software, or other resources that facilitate the functionality of an application, software, or process. Definition: A plugin is any component or service within an application or system that adds additional features or functionality beyond what is currently provided by the main component(s). This can include custom libraries, extensions, widgets, and modules. Plugins are essential for making an application robust and versatile in response to changing user needs and environments. So, plugins1 would be the part of a larger object (application or system) that adds more features.