Transmission Control Protocol/Internet Protocol (TCP/IP) is the basic communication language of the Internet. It is designed to be a two-layer programming word structure. The higher layer, TCP, reduces the file into small packets that are transmitted over the Internet and received by a TCP layer that unpacks the packets into the original message size. The lower layer, IP, is responsible for the address part of each packet ensuring that it gets to the right destination. Each gateway computer on a network checks this address to see where to forward the message. Even though some packets from the same message are routed differently than others, they are unpacked at the same destination.