What is a "blog"?

"Blog" is an abbreviated version of "weblog," which is a term used to describe websites that maintain an ongoing chronicle of information. A blog features diary-type commentary and links to articles on other websites, usually presented as a list of entries in reverse chronological order. 

Generally speaking (although there are exceptions), blogs tend to have a few things in common:

• A main content area with articles listed chronologically, newest on top. Often, the articles are organized into categories.
• An archive of older articles.
• A way for people to leave comments about the articles.
• A list of links to other related sites, sometimes called a "blogroll".
• One or more "feeds" like RSS, Atom or RDF files.