Wikipedia, is a free encyclopedia with over 5 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 prove that everything in the Wikipedia article is true - but if you find a fact that you need, you can use the citations and the list of references in the article to find out which source might have that fact.
And if you need help finding any of the sources listed in your Wikipedia article, just ask a librarian and we can help!