A Wiki is a website that anyone can edit. They usually have multiple pages, and links that lead from one page to another. Most Wikis only deal with one or two subjects, like Fantendo. Others, like Wikipedia, focus on everything and anything. Wikis that focus on a few things (Called Specialty Wikis), are usually much better for information if you know what you're looking for.

Wikis are populated by Users, Sysops, and Bureaucrats. They make up the basics of any Wiki.