IP:

An IP address ( Internet Protocol address) is a unique number, similar in concept to a telephone number, used by machines (usually computers ) to refer to each other when sending information through the Internet . This allows machines passing the information onwards on behalf of the sender to know where to send it next, and for the machine receiving the information to know that it is the intended destination. An example of an IP address is 212.116.XX.XX.

IP Technology:

( I nternet P rotocol) The network layer protocol in the TCP/IP communications protocol suite (the "IP" in TCP/IP). The terms "IP network" and "TCP/IP network" are synonymous. "IP" is generally heard more frequently than "TCP," primarily because it is faster to say IP and also because some data are sent over the unreliable UDP/IP, rather than the reliable TCP/IP. Streaming media, VoIP and videoconferencing use UDP/IP because there is no time or need to check for dropped packets and retransmit them.

Domain name:

A domain name is the unique name of a computer on the Internet that distinguishes it from the other systems on the network. They are sometimes colloquially (and incorrectly) referred to by marketers as "web addresses".