Joomla! is a free open source framework and content publishing system designed for quickly creating highly interactive multi-language Web sites, online communities, media portals, blogs and eCommerce applications.

Joomla! provides an easy-to-use graphical user interface that simplifies the management and publishing of large volumes of content including HTML, documents, and rich media. Joomla! is used by organisations of all sizes for Public Websites, Intranets and Extranets and is supported by a community of thousands of users.

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This allows file operations (such installing extensions or updating the main configuration) without having to make all the folders and files writeable. This makes the site admin's life a lot easier and increases security of the site

You can check the write status of relevent folders by going to ''Help->System Info" and then in the sub-menu to "Directory Permissions". With FTP even if all directories are red, Joomla! will operate smoothly.

NOTE: the FTP layer is not required on a Windows host.