Wiki is a piece of server software that allows users to freely create and edit web page content using any web browser. It was developed in 1993 by Ward Cunningham as a composition system. Wikis are fully editable websites that are easily accessible and allow contributors to feel a sense of responsibility and ownership. The main principles of wiki are that they are open, incremental, organic, mundane, universal, observable, and unified and tolerant. Wikis have applications for simple office software, project management, and point-of-sale systems.