Blog: a regularly updated website or web page, typically one run by an individual or small group, that is written in an informal or conversational style
A blog is created on a website and you can either work individually or with a small group. You keep your blog updated for people that like to look at it and because that's just what you do for a blog.
http://www.soccer-blogger.com/ I like this blog because it has stuff about my favorite sport.
