A blog (a portmanteau of web log)
is a website where entries are written in chronological
order and commonly displayed in reverse chronological order.
"Blog" can also be used as a verb, meaning to maintain or
add content to a blog. 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 for 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 (artlog), photographs (photoblog), sketchblog,
videos (vlog), music (MP3 blog), audio (podcasting) and are
part of a wider network of social media. Micro-blogging is
another type of blogging which consists of blogs with very
short posts. – wikipedia.com
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a list with more information about Blogging. Check it out.