If you're not familiar with the term, a "wiki" is a type of website that allows a number of people to add, change, and delete information, and many organizations are finding that it can be an invaluable tool for sharing information and getting the word out about what they do. The most famous of them all is probably Wikipedia, which is an online encyclopedia that is updated by thousands of volunteers around the world. The idea is that with so many people sharing their collective knowledge, everyone benefits.