Wikipedia is an online encyclopaedia that anyone can edit and contribute to. Wikipedia (Listeni/ˌwɪkɨˈpiːdiə/ or Listeni/ˌwɪkiˈpiːdiə/ wik-i-pee-dee-ə) is a free-access, free content Internet encyclopedia, supported and hosted by the non-profit Wikimedia Foundation. Anyone who can access the site can edit almost any of its articles. Wikipedia is the sixth-most popular website and constitutes the Internet's largest and most popular general reference work. As of February 2014, it had 18 billion page views and nearly 500 million unique visitors each month. Wikipedia has more than 22 million accounts, out of which there were over 73,000 active editors globally as of May 2014. Jimmy Wales and Larry Sanger launched Wikipedia on January 15, 2001. Sanger coined its name, a portmanteau of wiki (from the Hawaiian word for "quick") and encyclopedia. Although Wikipedia's content was initially only in English, it quickly became multilingual, through the launch of versions in different languages. All versions of Wikipedia are similar, but important differences exist in content and in editing practices. The English Wikipedia is now one of more than 200 Wikipedias, but remains the largest one, with over 4.6 million articles. Wikipedia has earned a reputation as a news source because of its rapid updating of articles related to breaking news. However, Wikipedia's high openness has also led to some concerns, such as the quality of its writing, vandalism and the accuracy of its information. However, while some articles contain unverified or inconsistent information, a 2005 survey of Wikipedia published in Nature based on a comparison of 42 science articles with Encyclopædia Britannica found that Wikipedia's level of accuracy approached Encyclopædia Britannica's, and both had similar low rates of "serious errors". As of 2014, the English Wikipedia contained over four and a half million articles, over thirty times as many as Britannica (about 120,000).
Best choice for a quick answer
Being a crowd sourcing encyclopedia, Wikipedia is as comprehensive as any free online information source could be. Unfortunately, for the same reason, it contains inaccurate materials. This is why Wiki would be the best choice if someone want a quick answer. It would be better if proper credentials are required.
It is a great place to start a research and help you get a general picture of the topic, but keep in mind that when it comes to academic use Wikipedia should never be used alone.
Wikipedia is very easy to use, it offers information to almost everything and makes it usually the first source people would seek from.
Tips for using the product
Go to “Reference” at the bottom to look for more trustable source of a piece of information.