Wikipedia.org is an online dictionary that really helps. It is not like some kinds of online
dictionaries that feature unimportant articles in their site. It is also easy to update anything you want to add to a certain article.
Once, I looked for the word "Makiling", which is a mystical mountain in the Philippines, and also a beautiful lady who is known as Maria Makiling (she is a legend here in the Philippines. There were enough facts about Makiling but I wanted to add some more facts that I know about the mountain and Maria Makiling.
So, I added a few things about Makiling and, poof! There it was on the page when I checked the article again.
Wikipedia is a wonderful site, and also useful, especially for children and young adults who wants to research about something. Check www.wikipedia.org to know about some things you want to learn about.