A social engine plugin is an extension to the SocialEngine platform. SocialEngine is designed to be able to accommodate various functionality extensions. Although they are known under different names, terms 'mod', 'module', 'plug-in', 'plugin', 'widget', 'add-on', 'addon' are all essentially the same all they are – combinations of coded materials, made specifically to customise Social Engine social network system that is "plugged into" it, implying ease and simplicity of the process. Although the term "socialengine plugin" is the most popular other names are equally acceptable. On this site you can find a variety of these pieces of social engine software.