Wikipedia.org - best online free encyclopedia.It is mostly used, prefered and trusted encyclopedia. It is full of knowledge.It has Information on almost any topics.Whenever we search for any kind of information in Google or any other search engine, mostly first link available is of Wikipedia.org page.Information provided by Wikipedia.org is correct and has much more information than any other websites.No doubt Wikipedia.org provide accurate, in details, point by point information on any topic.I had first used wikipedia when I was in college, it helped me lot for completing my assignments and clearing my doubts.It is most reliable source for information, one should alway refer Wikipedia for authentic information, along with books Wikipedia should also be refered for some extra information.
Overall it is best website for information, one should always refer this website for genuine information.