So what is a wiki? Simply put, it’s a website that anyone can edit directly in a web browser without any special editing tools or applications. With many wikis there is no special markup to learn. Editing a wiki-based website can be as easy and intuitive as using a simple word processor.
Like websites, wikis have grown to be useful in any number of ways. The potential of the wiki technology is only limited by the imagination of those who use it. What makes wikis so special is the “anyone can edit” capability, which means that development of a wiki is driven by the community of people who use it rather than an individual or a company.