A wiki is a website that allows users to collaboratively create and edit content using a simplified markup language. Wikis are commonly used to build collaborative websites and community sites. Wikipedia, the online encyclopedia, is one of the best known examples of a wiki. Wikis allow users to easily edit pages by starting text with symbols like asterisks for bullet points. Links between pages are created with a specific syntax. The universal edit button is a green pencil icon that indicates if a webpage, like a wiki, can be edited.