If you're not familiar with blogging, it's Web logging, a form of personal Web publishing. Typically, blogs are updated on a more frequent basis than other personal Web sites and include links to content selected by the author—thoughts and opinions, journal items, and comments from readers about the blog entries.
Blogs have caught the attention of the press because they're a unique form of expression and news distribution that's growing rapidly. By some estimates, there are over 1 million active bloggers worldwide.
Registered users can make comments on your blog (if you enable the Comments feature) and you can setup your blog for syndication for other blog RSS feeds to access.