Wikipedia is a free online encyclopedia created and edited by volunteers around the world and hosted by the nonprofit Wikimedia Foundation. Its mission, reflected in its broad multilingual edition, is to make knowledge freely accessible. Readers can explore millions of articles across subjects and languages, search for information, and contribute to the encyclopedia. The official Wikipedia app lets users save favorite articles for offline reading, sync reading lists across devices, and customize their experience.

Wikipedia is part of a wider collection of free knowledge projects hosted by the Wikimedia Foundation. These include Wikimedia Commons for free media, Wikivoyage travel guides, Wiktionary dictionaries, Wikibooks textbooks, Wikidata’s knowledge base, Wikiversity learning resources, Wikiquote quotations, MediaWiki wiki software, Wikisource’s free-content library, Wikispecies species information, Wikifunctions, and Meta-Wiki for community coordination and documentation. The foundation invites readers to support its work through donations and states that it does not sell donor information. Wikipedia’s content is available under the Creative Commons Attribution-ShareAlike License, supporting its reuse and collaborative development.