In the English Wikipedia, verifiability means people using the encyclopedia can check that the information comes from a reliable source. Its content is determined by previously published information rather than editors' beliefs, opinions, experiences, or previously unpublished ideas or information. Even if you are sure something is true, it must have been previously published in a reliable source before you can add it.[a] If reliable sources disagree with each other, then maintain a neutral point of view and present what the various sources say, giving each side its due weight.

All material in Wikipedia mainspace, including everything in articles, lists, and captions, must be verifiable. Additionally, four types of information must be accompanied by an inline citation to a reliable source that directly supports[b] the material. The four types are:

Any material that needs an inline citation but does not have one may be removed. Please immediately remove contentious material about living people (or existing groups) that is unsourced or poorly sourced.

For how to write citations, see citing sources. Verifiability, no original research, and neutral point of view are Wikipedia's core content policies. They work together to determine content, so editors should understand the key points of all three. Articles must also comply with the copyright policy.

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