The difference between a blog and a website

All in all there isn't much difference between a blog and a website ....
BUT the basic difference between a blog and a website is that on a website your main page remains static (it is constantly changing in case of a blog) and other pages contain mostly static information. On blogs — at least on majority of blogs — you can leave comments and interact with bloggers and other visitors. Most of the times this does not happen in case of a website although even on a website you can have online forums and discussion threads.