The term "home page" is used for a website that belongs to a person or thing. Also it can used as a term for the page you set off from in your web browser. Finally it's used as a description of the main page of a website which serves as an introduction and start point for exploring the rest of the site.
Personal home pages tend to house peoples weblogs and up to date ways to get in touch, and often some content they have made (art, programs, photos etc).
Similarly "things" have home pages designed often as gathering point for people intested in a topic, where they can get in touch and share news about whatever the homepage is dedicatd to. Subject oriented hompages tend deffer from regular web sites in that they are genrerally focused on their topic, where as other sites are more general (such as e2) or provide a service (such as google).