What's a Blog?

ok, so I'm new at these things! I don't have a problem shopping online (lots of practice - don't tell!) but up until recently, when my apparently blog-savvy SIL (sister in-law), set up a blog and sent me a link, I had no idea what a blog was (sounds like a Nickelodeon substance to me!) I had heard of blogs before, and I knew that they were some sort of personal website (right?) but that's it. I still have no idea what I'm doing. I did manage to set this (Nickelodeon substance) up though, thanks to this Blogger website (where they're accustomed to dealing with isolated people like me) and here's my very first post (isn't that something you build a fence with?) I've looked at other people's (fence building materials) on their (Nickelodeon substances) and hope mine's cool and fun to look at like theirs. If all else fails, I'll just put lots of pictures of my kids up, now who could resist that?