A plugin is a piece of software including a group of functions that can be contributed to a WordPress site.
http://rafaelmpko437.jigsy.com/entries/general/a-plugin-is-a-piece-of-software-including-a-group-of-functions-that-can-be--contributed-to-a-wordpress--site-
A plugin is a piece of software including a group of functions that can be contributed to a WordPress site.