A wiki is a website that allows collaborative editing of its content and structure by its users. Wikis are easy to update and customize. The most well-known wiki is Wikipedia, which hosts over 10 million articles across 253 languages as of 2008. Wikis can be used by communities, organizations, schools, and businesses to collaboratively author and edit documents, manage projects, and share information in a central location. Common uses of wikis include establishing an internal company website or intranet, organizing meeting notes and documents, and managing calendars and agendas. Popular wiki platforms include WikiSpaces, MediaWiki, and PBWiki.