AnarWiki is a collaborative online encyclopaedia focused on anarchist ideas, history, literature, and people. It presents itself as a comprehensive resource for readers exploring anarchism, including those who are new to the subject. Its articles cover concepts, communities, organisations, books, and notable anarchists, alongside material on feminism, socialism, worker management, and anarchist societies. The site also offers introductory explanations and question-and-answer content, such as discussions of cooperation, mutual aid, and common objections to anarchist thought.

AnarWiki continues the work of the deleted Libertarian Socialist Wiki and incorporates material from sources including An Anarchist FAQ, Anarchy Works, and Anarchy In Action Wiki. It invites visitors to contribute new content or correct existing entries, making community participation part of the project. The site reports more than 1,000 articles and is supported by the Anarchist Federation of Cyber Communes. Its content is generally available under the Creative Commons Attribution-ShareAlike 4.0 International licence, unless otherwise noted.