Web Page vs. Blog Post

I think the main differences between a traditional web page and a blog are the potential for a high level of interactivity in blogs and also that content in a blog should constantly be being added while a traditional web site has set content that is only revised when some specific information noted there (e.g. opening times of a business) is changed.  A blog is typically more interactive in that has frequent additions and it allows followers to comment on things others have posted.  I think you could draw a rough analogy to a web site being like a broadcast lecture which goes out one-way to listeners while a blog could be more like a radio call-in show with listeners able to join in with questions and comments.