A wiki is a simple, easy-to-use user-maintained database for creating, browsing and searching information that can be collabortively edited in realtime. A wiki is sort of a web site and a word document. At its simplest, it can be just like any other web site, with no access privileges, but its real power lies in the fact that groups can collaboratively work on the content. Another element of a wiki is its ability to keep track of the history of a document as it is revised. Each time a person makes changes to a wiki page, that revision becomes the current version, and the older version is stored. Versions of the document can be compared side-by-side, and edits can be rolled back if necessary.
Blogs and wikis both enable communication of information by a person or group of people, and provide a platform for feedback: blogs in the form of comments, and wikis by letting users edit the contents of a given page.
Difference between a wiki and a blog which I found on a post by Frank Jordan in the Traction Software Company blog:
Both are systems for posting, editing, and managing a collection of hypertext pages (generally pertaining to a certain topic or purpose)...
Blog: ...displayed as a set of pages in time order...
Wiki: ...displayed by page as a set of linked pages...
...and optionally including comments, tags or categories or labels, permalinks, and RSS (or other notification mechanisms) among other features.
Both "blog" and "wiki" style presentations can make pages editable by a single individual or editable by a group (where group can include the general public, people who register, or a selected group).
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