Is Wikipedia a reliable source of information?

 nothing more convenient than Wikipedia if you're looking for some quick information, and when the stakes are low (you need a piece of information to settle a bet with your roommate, or you want to get a basic sense of what something means before starting more in-depth research), you may get what you need from Wikipedia. In fact, some instructors may advise their students to read entries for scientific concepts on Wikipedia as a way to begin understanding those concepts.

Nevertheless, when you're doing academic research, you should be extremely cautious about using Wikipedia. As its own disclaimer states, information on Wikipedia is contributed by anyone who wants to post material, and the expertise of the posters is not taken into consideration. Users may be reading information that is outdated or that has been posted by someone who is not an expert in the field or by someone who wishes to provide misinformation. (Case in point: Four years ago, an Expos student who was writing a paper about the limitations of Wikipedia posted a fictional entry for himself, stating that he was the mayor of a small town in China. Four years later, if you type in his name, or if you do a subject search on Wikipedia for mayors of towns in China, you will still find this fictional entry.) Some information on Wikipedia may well be accurate, but because experts do not review the site's entries, there is a considerable risk in relying on this source for your essays.

The fact that Wikipedia is not a reliable source for academic research doesn't mean that it's wrong to use basic reference materials when you're trying to familiarize yourself with a topic. In fact, the library is stocked with introductory materials, and the Harvard librarians can point you to specialized encyclopedias in different fields. These sources can be particularly useful when you need background information or context for a topic you're writing about.

Wikipedia is not considered a credible source. Wikipedia is increasingly used by people in the academic community, from freshman students to professors, as an easily accessible tertiary source for information about anything and everything. However, citation of Wikipedia in research papers may be considered unacceptable, because Wikipedia is not considered a credible or authoritative source.[1][2][3]This is especially true considering anyone can edit the information given at any time, and although most errors are immediately fixed, some errors maintain unnoticed. However, it can be noted that Wikipedia's Good Articles and Featured Articles are some degree more advanced, professional, and generally more credible than an article not labeled Good or Featured. It is because these articles are reviewed heavily and edited many, many times, passing various "tests" before being confirmed Good or Featured, that they can be used for some deeper research than usual. It is Wikipedia's Featured Articles that are especially trustworthy in contrast to normal or even good articles, as they have to pass even more rigorous "tests" to become featured, as they are to be "the best of Wikipedia", "a model for other articles", and thus, a much more reliable source than average articles.

Not 100%, so  it's better to use another site beside it to confirm the reliability of the information.

Wikipedia is not a reliable source of information because even though Wikipedia is one of the Webs most popular reference sites, it isnt a credible resource because anyone is allowed to be a contributor to the website.

But it is very useful and popular source of information. However the information  shall be validated by other reliable sources.

may be but all internet are editable.