You've gotten some definitions of "wiki", but to put it more simply: A "wiki" is a freely available and simple method of creating a website that contains lots of user generated pages. Many different versions of the software that generates the wiki are available, usually for free, from a number of different sources. Most of them, by default, look a lot like wikipedia, since it is the biggest and most famous wiki, but that doesn't mean they are related and you can change the look and feel as much as you want when you create a wiki site. There are lots of wikis and generally they have nothing to do with each other. Not all of them have "wiki" in the name and many of them don't look like they are created using wiki software. Wikileaks looks a lot like wikipedia because the web designer didn't change most of the defaults in the software used to create the website, which apparently looks a lot like wikipedia by default. But the two have nothing at all to do with each other except that the software used to generate the websites are similar and the look is similar. Millennium@moses: I'm not sure, but wikipedia transfering the domains to wikileaks may be a result of the requirements of the Digital Millenium Copyright Act. Perhaps they purchased the domains to prevent other companies from creating fake versions of their site and siphoning off their users, but when wikileaks, which is really fundamentally different in purpose and effect, came along, they were forced to avoid illegally siphoning off their users. Again, this is just an educated guess.