What is a blog?

Here I am, with a blog, yet I have no idea what a blog really is. I hope that I'm doing it right. Maybe I'll do it a lot, maybe I won't. Do you even do a blog? Or do you just blog? Or do you work on your blog? Maybe write on it? Is the blog the website? I really have no idea, but everybody else is doing it, and I have nothing better to do, so I figured, hey, why not? Sorry if you find me boring, but I don't really care, because I think that I'm fascinating. Just the other day I took a 2 hour nap.