American Heritage Dictionary: en·cy·clo·pe·dia n. A comprehensive reference work containing articles on a wide range of subjects or on numerous aspects of a particular field, usually arranged alphabetically.There's a couple of Websites I use all the time. One of them is Wikipedia. Thousands of people have contributed to this resource. It was time for me to give back, so today I added to a Wikipedia entry.
In case you're unfamiliar with it, Wikipedia is the free encyclopedia that anyone can edit. All it takes is a registration, and you can add to any article. If you add incorrect information, you'll be called on it, and the information will be removed, so the accuracy of the information is self-policed. There have been some problems with companies editing their own articles to put a more positive spin on them; WikiScanner now tracks the comments on entries back to the IP address of the computer that generated them, so once-anonymous writers aren't quite so anonymous anymore.
I added some information to the Missouri portal (a page that serves as a "main page" for the state I live in). What a feeling of power to know that many people may read the words I wrote!