Wiki software (also known as a wiki engine or wiki application) is collaborative software that runs a wiki, i.e., a website that allows users to create and collaboratively edit web pages via a web browser. A wiki system is usually a web application that runs on one or more web servers. The content, including all current and previous revisions, is usually stored in either a file system or a database.
Wiki software was invented and first created by programmer Ward Cunningham in 1995. There are currently dozens of actively maintained wiki engines, in a variety of programming languages, including both open source and proprietary applications.