I think the main difference between a blog and a traditional web page is that blogs are dynamic, while web pages are (traditionally) more static. When I think of a blog, I picture a running online diary or journal that is updated frequently and contains links to outside, related resources. Blogs are usually focused on one or a few specific categories, which can be anything from mathematics education to politics to cooking. Much of the time, blogs can also be very personal, giving the author's opinions and views on his or her chosen subject or subjects. Blogs are also interactive, and often include conversations through comments that readers can leave after each post. This interactivity can also take the form of communities, where different bloggers from related fields of interest may comment on each others' postings, link to each other, and maintain ongoing conversations. When I think "traditional web page", I picture a site that is more like a commercial or informational site. They aren't updated as frequently as blogs, and are more geared towards providing information on a company or service, giving advice or instructions, or simply presenting content. These sites are less personal and less interactive. Instead of public comments, traditional web sites will often have "contact" links for viewers to submit comments or questions. As I write this, I realize that, of course, these distinctions are becoming less and less relevant, and there are many exceptions to any generalizations I'm making here: there are commercial blogs and personal web pages; blogs with little interaction and highly interactive web pages. I don't think many people see the distinction as very important any more, either; many people refer to their blog as their "web page", and I don't see anything wrong with that.
