URLs provide a standard format for the transmission and reception of a wide variety of information types. Also you will be able to ascertain what kind of organization or institution the information is coming from. A computer file is about to be sent to your computer. It sends a message to a server , or computer where a Web site resides, asking it to send you information.
Most servers have a name of some kind.
Many are, but that is a simple matter of choice. The domain is key to understanding where the information is coming from. This is an important consideration when you are trying to evaluate an electronic document. Don't forget, the Internet is vanity publishing on its largest scale. Click here for a list of domain types and what they mean.