Wikipedia is a wiki. It is an encyclopedia that anyone can edit (they do have a few restrictions though, to protect the sites content). Their editors include everything from PhD graduates to high school students. If we had to thank the internet for one thing it would be Wikipedia. (It’s an encyclopedia of everything, anything, both and neither.)
If you like Wikipedia, contribute – you can write an article, edit one, or even donate to Wikipedia.
Although there is no app for Windows Phone, there is a third-party Wikipedia app for Windows Phone.