What Are WordPress Plug-Ins?

WordPress plug-ins are functions written in php (a scripting language) that can extend the capabilities of your WordPress blog or website. Developers create both free and paid WordPress plug-ins, and you can access a huge variety of WordPress plug-ins in the WordPress Plugin Directory at wordpress.org/extend/plugins.
Some WordPress plug-ins come preinstalled with WordPress, but most must be uploaded individually to your WordPress plug-ins folder. Some might be included as part of a theme upload, as discussed in Chapter 17.
Plug-ins are what set WordPress apart from other blogging applications because they add so much more functionality above and beyond traditional blogging features, other blogging applications ...

Get The Complete Idiot's Guide® To WordPress now with O’Reilly online learning.

O’Reilly members experience live online training, plus books, videos, and digital content from 200+ publishers.