The content of Wikipedia is expected to meet two fundamental requirements:
Verifiability means that any piece of information presented must be found in a reliable published source. The source may say it in different words, but there must be no doubt that the information presented is implied by what the source says.
Wikipedia is not a place to publish original research or original thought. The results of new experiments can be included only after they have appeared in a reliable source. Similarly, it is not acceptable to put together published facts to reach an original conclusion, except in completely routine and uncontroversial cases (such as straightforward calculations).
In order to ensure verifiability, editors are encouraged to add citations to support the information in articles. Dubious information for which attempts to find sources have failed should be removed. (Particularly egregious or defamatory unsourced information should be removed anyway.)
Neutral point of view means the following: