JoomSEF is SEO compoenent for Joomla! CMS. Its primary function is to convert most of the Joomla URLs into SEF format. On contrary to Joomla built-in SEO capabilities, JoomSEF URLs appearance can be customized. SEF - search engine friendly format means the URLs are better Readable and understandable for humans a better rated by search engines. JoomSEF also helps to manage meta data for all the site pages - even those that do not support metas by its design, create sitemaps, protect Joomla site from URL injection attacks, etc.