TCP/IP is a protocol suite and it is now the dominant framework for expressing the procedures for establishing and maintaining connections over networks and across the internet. The framework contains many individual protocols, which each describe one aspect of network procedures. These protocols are grouped into two levels: The Internet Layer and the Transport Layer. The most important protocol in the Internet Layer is the Internet Protocol. This is where the “IP” of TCP/IP comes from. You will see many internet-related things that have the letters IP in them, for example, internet telephony is called VoIP, which stands for Voice over IP. The most important protocol in the Transport Layer is the Transmission Control Protocol, which is the TCP in TCP/IP and it explains procedures to forge, maintain, and end network connections.