Joomla! is an Open Source content management system for creating web sites. It allows you to create successful websites without having any design or script programming knowledge. In addition, Joomla! is completely free and has a great support by its big community.
With Joomla, you can make any type of website. There are thousands of templates and extensions that will allow you to build the website you want.
For more information about Joomla, you can check the official website of the project and its different sections:
Joomla! Download Page: Get Joomla!.
Joomla! Demo Site: Try Joomla!.
Technical Requirements: Get ready to install.
Joomla! Site Showcase: See great Joomla! sites.
Joomla! Extensions Directory: Find an extension.
Joomla! Resources Directory: Find Joomla! Professionals.
Joomla! Core Features (pdf) or this page: Learn what Joomla! includes.
Joomla! Forums: Get support.
About The Joomla! Project: Learn who we are and how we’re organized.