Websites are often a blend of information, entertainment and advertising. Anyone can publish on the world wide web; be selective; ask yourself the 5W's. (Remember that library databases do not count as “using the Internet” and are an excellent source of information for your papers.)
chart courtesy of Baker College Libraries guides.baker.edu/library
The domain name gives some indication of the source and intended audience of a web address.
IANA Root Zone Database maintains details about top level domain names