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Public wikis are wikis that can be read by anyone ; usually ( though not always ), they can be edited by anyone as well, though sometimes registration is required.

Among public wikis, MediaWiki is the dominant software: it powers the world's most popular public wiki, Wikipedia, as well as the most popular wiki farm, Wikia, and it is the most popular software in use on other public wikis as well.

Other wiki engines used regularly for public wikis include MoinMoin and PmWiki, along with many others.