What's A Blog??

So really, I only vaguely know what a blog actually is, and yet here I am. I've been reading lots of articles that say I should have one... I see that quite a few people actually do.. and although I'm much more of a leader than a follower.. I guess I'm going to let "peer pressure" take over on this one and give it a try... this should be fun?!?! or maybe a complete train wreck... either way hopefully it will at least be entertaining. :)