Hello Friends..........
MediaWiki is free, open source software that is written in PHP. The software was originally used to develop the now famous Wikipedia but is now available under the GNU General Public Licence. It uses a MySQL or PostgreSQL database to store the information. WikiMedia uses the wikitext format, a format that is almost like the WYSIWYG format that allows users to edit content without any knowledge of XHML or CSS. Even if a mistake is made or a page vandalised, MediaWiki always keeps a backup of previous pages to allow users to easily rollback to a previous version.
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