noun. A type of collaborative on-line software that allows readers to add content on a subject, which can also be edited by others. For example: Wikipedia.
The major difference between a blog and a wiki is that a blog is more directly under the control of the owner(s) and the primary objective of a blog is for the owner(s) to express themselves to their target audience. A wiki on the other hand is about collaboration (in a general sense) rather than expressing views.
Wiki definition included as many people have asked us to describe the difference between a blog and a wiki.
