This tutorial is a brief introduction to plugins in WordPress. Plugins and their settings, functions, etc. vary widely in WP, so we'll just be covering basics here.

Plugins are essentially little packages of code that extend/add to the functionality of your WordPress site. Think of them as being just like extensions/add-ons in internet browsers, or the apps on a smartphone. Plugins can add to the front-end functionality of your site (such as enabling true full-width pages) and to the back-end functionality (such as having a more robust visual text editor).

If there's something that you wish you could do with your WordPress site, but you can't do it through customizing the theme or changing site settings (or can't figure it out easily), it's extremely likely that there's a plugin that will enable you to do what you want to do.