This document discusses wikis and their history. It notes that Ward Cunningham created the first wiki called the WikiWikiWeb in 1995. It grew popular for being a simple collaborative website that allowed anyone to easily edit pages. Major wiki sites now include Wikipedia, the free online encyclopedia, and Wikimedia which hosts Wikipedia as well as Wiktionary, Wikibooks, and others. Wikis are increasingly used for knowledge sharing and collaboration in both personal and professional settings.