Some of the best features of MediaWiki are not built into the core software. Instead, they are available as [[extensions]]. Like the core, they are also freely available, easy-to-use and generally well documented. But again, it takes a dedicated professional to keep pace with the ongoing development of these extensions over time - ensuring that the right ones are deployed in the wiki and that the features of the system are obvious and accessible to its users.
There are a few extensions which are game-changers: Semantic MediaWiki, [[Collections]] and the [[Visual editor|Visual Editor]].
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