provides information about Wikipedia, its policies, guidelines, rules, etc. along with some help about MediaWiki that is particular to Wikipedia
Copied from Meta-Wiki's help namespace
Meta-Wiki
Meta-pages
Pages related to Meta-Wiki, not to other Wikimedia projects
document the basic, technical features of MediaWiki
MediaWiki.org
All general information about the software.
Organisation of MediaWiki.org, this namespace should be as small as possible.
Set of basic help pages for users of an existing wiki (formatting etc.) The first aim is a complete English version, that can be shipped with the MW distribution. Contributions in this namespace are to be licensed in the public domain.
Additional namespaces
MediaWiki.org has two additional namespaces:
Manual :All technical or more detailed stuff behind the surface, that is not part of the basic help pages (full handbook, mainly for the ones who want to set up an own wiki).
Extension :All extensions and directly related stuff.