IP Address

A unique number used to specify hosts and networks. Internet Protocol (IP) numbers are used for identifying machines that are connected to the Internet.

They are sometimes called a dotted quad and are unique numbers consisting of 4 parts separated by dots, They would look something like this 216.119.81.205 Every machine that is on the Internet has a unique IP number - if a machine does not have an IP number, it is not really on the Internet. Most machines also have one or more Domain Names that are easier for people to remember.