A web content management system is a software system used to manage and control a large, dynamic collection of web material (HTML documents and their associated images). A CMS facilitates document control, auditing, editing, and timeline management.

Usually the software provides tools where users with little or no knowledge of programming languages and markup languages can create and manage content with relative ease of use. Most systems use a database to store content, and a presentation layer displays the content to regular website visitors based on a set of templates. Administration and content creation is typically done through the web application, but some CMS may be modified in other ways.

A CMS allows non-technical users to make changes to an existing website with little or no training. Web CMS typically require an experienced coder to set-up and add features, but it is primarily a website maintenance tool for non-technical administrators.

Joomla! CMS
Joomla! is a free and open source content management system (CMS) for publishing content on the World Wide Web and intranets and a model–view–controller (MVC) Web application framework that can also be used independently.
Joomla is written in PHP, uses object-oriented programming (OOP) techniques (since version 1.6[2]) and software design patterns, stores data in a MySQL or (since version 2.5) MS SQL database, and includes features such as page caching, RSS feeds, printable versions of pages, news flashes, blogs, polls, search, and support for language internationalization.
As of March 2012, Joomla has been downloaded over 30 million times. Over 9,200 free and commercial extensions are available from the official Joomla! Extension Directory, and more are available from other sources. It is estimated to be the second most used CMS on the Internet after WordPress.
The name is an English spelling of the Swahili word jumla meaning "all together" or "as a whole". It was chosen to reflect the commitment of the development team and community to the project.

From Wikipedia, the free encyclopedia