WikiWikiWeb is a common name for a class of very simple content management system, invented by Ward Cunningham. It allows a Web site to be written by its users; anyone can modify any page or create new pages without even rudimentary knowledge of HTML. User edit the content of a page in plain text format, using some very simple formatting rules. The server utility called "Wiki engine" parses the text and converts it into well-formed HTML where pages are properly interconnected. Wiki engine also indexes these pages to make links bidirectional: one can both follow links from a given page and go to pages that refer to the given one.