Wikipedia, is a free encyclopedia with over 4 million articles in multiple languages, created by users all over the world. Can you trust all of them? Probably not, although this website can be great for finding a quick answer when you don't need the information to be 100%-guaranteed accurate.
Your professor or teacher might say that you can't use Wikipedia when you're writing a research paper - but this doesn't mean that it's not useful to you in your research. Many of the articles in Wikipedia have citations indicated throughout them, and a list of references at the end where the authors are claiming to have found their information. This doesn't mean that you can take the Wikipedia information as authoritative - but if you find a fact in it that you need, you can use the citations and the list of references in the article to find out which possibly-authoritative source might have the fact.
And if you need help finding any of the sources listed in your Wikipedia article, just ask a librarian and we can help!