A wiki is a web application that allows users to add content, as on an Internet forum, but also allows anyone to edit the content. Wiki also refers to the collaborative software used to create such a website. From : en.wikipedia.org/wiki/WIKI Wiki software is a type of collaborative software that runs a Wiki system. It is usually implemented as a server-side script that runs on one or more web servers, with the content generally stored in a relational database management system, although some implementations use the server's file system instead. From : en.wikipedia.org/wiki/Wiki_software