A plugin is a piece of software application containing a group of functions that can be added to a WordPress site.

http://sergiubaluta.com/site/redirect.php?url=http://titusgrjv695.almoheet-travel.com/a-plugin-is-a-piece-of-software-application-containing-a-group-of-functions-that-can-be-added-to-a-wordpress-website

A plugin is a piece of software consisting of a group of functions that can be added to a WordPress website.