Website and Blog Differences

I am brand new to blogging.  Honestly, even after watching the tutorials, I still do not completely understand the purpose.  I am not sure it is something I would in my classroom, however, I am going to remain open to it.  I can see the benefits of students being able to discuss lesson ideas together in this format.  The first difference I see between a blog and a website is that many people can author and comment if invited.  Numerous people can state opinions.  On a website, there is only one author providing information.  The second difference I see is the formatting of the page.  Blogs go in a continuous stream whereas websites do not.