What is a "blog"?
"Blog" is an abbreviated version of "weblog," which is a term used to describe web sites that maintain an ongoing chronicle of information.
A blog features diary-type commentary and links to articles on other Web sites, usually presented as a list of entries in reverse chronological order. Blogs range from the personal to the political, and can focus on one narrow subject or a whole range of subjects.
GM: Blogs can also get used by educators to share their knowledge...
Via Gust MEES, Ray Tolley