What is Blog

A blog (a blend of the term
"web log") is a type of
website or part of a website.
Blogs are usually maintained by
an individual with regular
entries of commentary,
descriptions of events, or other
material such as graphics or
video. Entries are commonly
displayed in reverse-
chronological order. "Blog" can
also be used as a verb, meaning
to maintain or add content to a
blog.
Most blogs are interactive,
allowing visitors to leave
comments and even message
each other via widgets on the
blogs and it is this interactivity
that distinguishes them from
other static websites.
Many blogs provide commentary
or news on a particular subject;
others function as more
personal online diaries. A typical
blog combines text, images, and
links to other blogs, Web pages,
and other media related to its
topic. The ability of readers to
leave comments in an
interactive format is an
important part of many blogs.
Most blogs are primarily textual,
although some focus on art (Art
blog), photographs (photoblog),
videos (Video blogging), music
(MP3 blog), and audio
(podcasting). Microblogging is
another type of blogging,
featuring very short posts.
As of December 2007, blog
search engine Technorati was
tracking more than 112,000,000 blogs.

From wikipedia