What does it mean?

Wiki is a type of website that allows visitors to easily add, remove, or otherwise edit and change some available content, sometimes without the need for registration. This ease of interaction and operation makes a wiki an effective tool for collaborative authoring. The term wiki can also refer to the collaborative software itself (wiki engine) that facilitates the operation of such a website, or to certain specific wiki sites, including the computer science site (an original wiki), WikiWikiWeb, and the online encyclopedias such as Wikipedia.

The first such software to be called a wiki, WikiWikiWeb, is named by Ward Cunningham. Cunningham remembered a Honolulu International Airport counter employee telling him to take the so-called "Wiki Wiki" Chance RT-52 shuttle bus line that runs between the airport's terminals. According to Cunningham, "I chose wiki-wiki as an alliterative substitute for 'quick' and thereby avoided naming this stuff quick-web." "Wiki Wiki" is a reduplication of "wiki", a Hawaiian-language word for fast. The word wiki is a shorter form of wiki wiki (weekie, weekie). The word is sometimes interpreted as the backronym for "what I know is", which describes the knowledge contribution, storage and exchange function.