a web of related pages, each of which has an idea (like WikiIntroduction )

a web of related pages, each of which has a picture (like OneMinuteWiki )

a web site which can be edited by everybody who visits it (most commonly without requiring that user to register before)

Quote from their front page: "(It is) ... a fun way of communicating asynchronously across the network", or as a set of web pages that are open and free for anyone to edit as they wish. Wiki is not real-time; therefore people have time to think before they follow up a web page, often days or weeks, so they have time to consider what they write. It was created for the discussion of People, Projects, and Patterns (a pattern is a recurring solution to a common problem in a given context and system of forces [Alexander 1977] [Alexander 1979]).