Everyone is hearing the buzz word about Wikis. What actually is a wiki. The word "wiki" comes from Hawaiian language, meaning "quick" or "fast."
A Wiki ([ˈwiː.kiː] <wee-kee> or [ˈwɪ.kiː] <wick-ey>) is a type of website that allows users to add, remove, or otherwise edit and change most content very quickly and easily.
This video gives a good explanation.

This video on Wikis in Plain English will give you an insight about how wikis work.
This is a simple explanation of how wikis work - in this case to plan a camping trip.

Watch the video below to learn on how to use wiki.com to search multiple wikis at once!