This is a maintenance category, used for maintenance of the Wikipedia project. It is not part of the encyclopedia and contains non-article pages, or groups articles by status rather than subject. Do not include this category in content categories.
This is a tracking category. It builds and maintains a list of pages primarily for the sake of the list itself. They are not part of the encyclopedia's categorization scheme.
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This is a category to help keep count of the total number of articles with the {{citation needed}} template. They should all be in one of the dated categories, which can be found at Category:Articles with unsourced statements.
With 533,470 articles in this category, it can be hard to choose which one to work on. The Citation Hunt tool makes the task easier by suggesting random articles, which can be sorted by topic-category membership.