All servers on the Internet have an IP address that consists of a set of four numbers like 123.45.6.78 By assigning a name to the IP address or vice versa - the web becomes easier to use. URL addresses (domain names) are obtainable from many sources. A domain name can have more than one IP address.

For example:

MYSITE.COM is assigned IP address 124.32.9.76 or

SALES.MYSITE.COM is assigned IP address 124.32.9.76 and 124.32.9.77