blog vs. website

In my opinion there seems to be a few major differences between a blog and a website.  First of all, a blog seems like an ever changing place were anyone (that you allow) can add their opinion.  Now on a website, it seems more permanent, meaning people that are viewing the site cannot change it.  Secondly, as far as I know, the blog was set up at no cost to me.  I don't think that setting up a website is free.  Lastly, setting up the blog was relatively easy.  From what I have heard setting up a website isn't so simple.  That is what I think the difference is between a blog and a website.