A blog is a Web journal, a diary, or a Web log to record online stories, interests, and daily life.
I find them - for the most part - incredibly self-indulgent and boring. It takes a certain type of person to think that their daily routines and their thoughts on life would conceivably be of any interest whatsoever to the world at large. They do though, in their tens of thousands - mainly in America, but the habit is creeping into our internet community now as well.
Words fail me.