What's a blog?

Salon.com: "What's a blog?
A blog, or weblog, is a personal Web site updated frequently with links, commentary and anything else you like. New items go on top and older items flow down the page. Blogs can be political journals and/or personal diaries; they can focus on one narrow subject or range across a universe of topics. The blog form is unique to the Web -- and highly addictive.
How does it work?
Salon Blogs are powered by Radio UserLand, a simple yet versatile software tool that lets you post new items from your Web browser with one click. Radio UserLand automatically builds your site, organizes and archives your posts, and publishes your content -- you don't need to know HTML, FTP, or graphic design. All you need to do is install Radio and begin publishing. You can publish written text, links, photos, documents, and more with just a single click of your mouse."