What is a Wiki Site?
According to Wikipedia, the world's largest wiki site:
A Wiki (/'wiki/ WIK-ee) is a type of website that allows users to add, remove, or otherwise edit and change most content very quickly and easily.
And that is it! This a customizable piece of the Internet where Users can edit content, upload files, communicate, share, and collaborate.
The word Wiki itself is the Hawaiian word meaning "quick", as the original wiki sites were designed for collaborates to quickly, and easily, share ideas.