Wikipedia uses the minimum of censorship. Generally, only gratuitous explicit (pornographic) images are removed. The community of Wikipedia editors determine what text and images are displayed, so there may be material that offends some people. There may be those who are offended, shocked or disgusted by medical images, nudity, religious imagery and controversial images.
Wikipedia cannot guarantee the validity of the information in this encyclopedia. Caution is advised when using Wikipedia as a source. In most academic institutions, references to Wikipedia, along with most encyclopedias, are unacceptable for research papers.
Cite it as you would any other web page in accordance with the normal citation practice the publication you are submitting the paper to follows. Citing the individual authors is not necessary, but you should at least include the date on which you retrieved the article (and ideally the full timestamp from the history).
Wikipedia has a tool to generate citations for particular articles. For the cite tool, see Special:Cite, or follow the "Cite this page" link in the toolbox on the left of the page in the article you wish to cite.
What should I do when I find a factual error in Wikipedia?
You should correct it. Wikipedia is written by volunteers who believe knowledge should be free for everyone, and the community is always ready to welcome new volunteers.
Because Wikipedia is an all-volunteer project that anyone can edit, errors or omissions can and do creep in. This should be kept in mind when reading; the very nature of Wikipedia means it should not be trusted completely. Articles frequently contain citations of authoritative works where a reader can verify the information found.
If you see that something can't be right but are not sure what the correct information is, you can signal the problem on the article's talk page: click the tab labeled "talk" on the top of the page, and next click the tab "new section".
Wikipedia is funded by donations and does not display any advertisements of any kind on any pages within Wikipedia's website. If you see any kind of ads, something on your end or in between will be placing them. Some browser extensions or plugins can do this - for example, Codec-C, Genieo, and InfoAtoms. Codec-C is marketed as needed to play videos. Your computer may also be infected with malware, which will commonly result in advertisements being placed within the websites that you visit. Installing and scanning your computer for infections using anti-malware software will usually resolve this issue. You may also be viewing a mirror or fork of Wikipedia that is hosted by someone else and not the Wikimedia Foundation. These unofficial forks have sometimes been reported to contain advertising or other content. The best way to resolve this matter is to verify that the URL that you're currently navigated to within Wikipedia begins with the following URL: https://en.wikipedia.org/. If you're unsure if this is the issue, simply copy the bold text and use your browser to navigate there. There may also have been inappropriate edits to Wikipedia that may have appeared as an advertisement. Such edits are against Wikipedia's policies and guidelines and should be removed upon discovery.
Where can I get more information about using Wikipedia?