"A wiki is a database of pages which visitors can edit live."
The building blocks of wikis are the "comments" from visitors.
You can generally edit a page in real time, search the wiki's content, and view updates since your last visit. In a "moderated wiki," wiki owners review comments before addition to the main body of a topic. Additional features can include calendar sharing, live AV conferencing, RSS feeds and more.
http://www.wiki.com/whatiswiki.htm
Wiki's would be very useful in a classroom. Wiki's helping kids be creative expecially, the students that don't talk a lot. Also, it is great for students and teachers to swap ideas with each other about projects. Some pro's about Wiki is that it for the most part gives a good summary of information for the students. Students can post comments about what they learned. Some con's about Wiki is that any one can post information on there and it may not always be true.
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