What is a blog?

Blog
[a.k.a. blogger -or-or- weblog -or- Web log -or- blogosphere]
A blog is basically a journal that is available on the web. The activity of updating a blog is “blogging” and someone who keeps a blog is a “blogger.” Blogs are typically updated daily using software that allows people with little or no technical background to update and maintain the blog.
Postings on a blog are almost always arranged in chronological order with the most recent additions featured most prominantly.
(source: www.blogphiles.com)