What VCS system does wikipedia, and other wikis use?

Question

Given a centralized wiki, what is the best way to track changes? What does wikipedia.org use?

Answer 1

Wikis do not usually use a source code version control system like Git. They each use their own way to track versions. MediaWiki (which is the software that Wikipedia runs on) stores all its pages and versions in a SQL database.

There is a Git-based wiki system called Gollum, but due to the decentralized nature of Git, it's not a "centralized wiki" as in your question.