Email allows users to send electronic messages to other users through communication networks. Messages are stored in recipients' mailboxes until opened. Wikis are collaborative websites that allow multiple authors to edit, modify, or delete content. The first wiki was created by Ward Cunningham in Hawaii, where "wiki wiki" means "quick." Social bookmarking lets users save bookmarked web pages publicly to share links. HTML is the markup language used to format web pages. Podcasts are downloadable audio or video files. VoIP uses the internet to make phone calls. Online chat provides text-based communication online. The World Wide Web (WWW) is a collection of internet resources accessed through browsers, created by Tim Berners-Lee in 1989.