You can edit some online encyclopedias such as http://www.wikipedia.org and http://icklepedia.com
Others, such as Encyclopedia.com don't and are edited by official authors.
The free encyclopedia that anyone can edit.
Wikipedia
Wikipedia is a free encylopedia that anyone can edit. It will ban you from editing for a certain amount of time if you cause vandalism.
Numerous people contributed to the Wikipedia biography of Stan Lee. Wikipedia is a free encyclopedia that anyone can edit.
encyclopedia
Some popular encyclopedia sets include Encyclopedia Britannica, World Book Encyclopedia, and Encyclopædia Universalis.
A wiki is a collaborative website which allows every logged-in member to edit the pages and contribute to the content of the site. Wikis are mostly used for documentation or encyclopedia types of sites as far as I know.
Encyclopedia Britannica.
No, an encyclopedia is a secondary source.
Wikipedia is an online encyclopedia while a plain encyclopedia is on paper.
The number of pages in an encyclopedia can vary depending on the edition, size, and content. A typical encyclopedia can range from a few hundred to several thousand pages.
No. However, the coincidence in names provides a fun tidbit. A wiki is defined as "A collaborative website which can be directly edited by anyone with access to it" - both WikiAnswers and Wikipedia are plays on this word: WikiAnswers is a site where anyone can ask, answer, and edit questions, whereas Wikipedia is a wiki-encyclopedia which anyone can read or edit.