In computing, a plug-in is a set of software components that adds specific capabilities to a larger software application. If supported, plug-ins enable customizing the functionality of an application. For example, plug-ins are commonly used in web browsers to play video, scan for viruses, and display new file types.
- reference – Wikipedia Plugins
Plugins are used to protect our blog pages from spam and other harmful content that could potentially cause our sites to be shut down.
Applications support plug-ins for many reasons. Some of the main reasons include: