Special pages are pages generated by the software on demand for special purposes, usually related to project maintenance. They are found in the
Special: namespace, a virtual namespace whose pages lack corresponding talk pages. They are not written in wikitext and can't be edited in the normal way; but elements of their pages can sometimes be edited through corresponding pages in the MediaWiki namespace. If you make a normal redirect to a special page, the redirect will not be immediately followed (though special pages can be targets of soft redirects), and creating any pages beginning with the
Special: prefix is also not possible.
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Special pages often take parameters. Sometimes these can be supplied after a slash (as in Special:Log/block); in other cases an index.php call is used; for example https://en.wikipedia.org/w/index.php?title=Special:RecentChanges&days=3&limit=10. Also, the content of most special pages depends on preferences that have been set by the user, e.g. classic or enhanced Recent Changes, the number of titles in Recent Changes and the watchlist, etc.
A directory of special pages can be accessed from Special:SpecialPages, which is found in the sidebar of every page on Wikipedia in the Tools section.