What is a Wiki Site?

According to Wikipedia, the world largest wiki site:

A Wiki ([ˈwiː.kiː] <wee-kee> or [ˈwɪ.kiː] <wick-ey>) is a type of website that allows users to add, remove, or otherwise edit and change most content very quickly and easily.

Essentially, that is all there is to it! This site is a customizable piece of the Internet where (for now) specific users can edit the content, upload files, communicate and collaborate.