URL(An address that uniquely identifies a location on the Internet. A URL is usually preceded by http://, as in http://www.microsoft.com. A URL can contain more detail, such as the name of a page of hypertext, often with the file name extension .html or .htm)
MAC address(A 12-digit hexadecimal address that is preprogrammed into a computer's network adapter, and that uniquely identifies that computer on the network)
IP address(A binary number that uniquely identifies a host (computer) connected to the Internet to other Internet hosts, for the purposes of communication through the transfer of packets)
