The contract guiding the transfer, or TCP, which is also the contract control the transmission or control protocol the transmission is also said to be the ... A set of protocols, a contract that is the basis for the internet.

TCP(based on IPv4) consists of four layers:

access layer to the network (Network Interface Physical)
layer connection or the internet (internet)
layer the communication is host to host or transfer (transport)
- layer Service Applications (Application)
for communication spoken by the internet, transport layer, two protocols TCP and UDP can be used. Protocol TCP data transfer with accuracy and high security can do, while the features of the UDP protocol rapid transfer of information, regardless of security issues for data transfer.

the most important task of TCP protocol ensure the accuracy of the posting information. Protocol, above, called "communication, connection oriented called. Cause this would create a virtual connection between computers, the sender and the receiver, after sending the data. Protocol, some of this type features more servants, in order to control possible errors in sending the information provided, but due to the increased load of the operational system, their performance will decrease. Protocol TCP as a protocol reliable also be remembered. To this cause, which to the knowledge of the accuracy of the information posted, etc. the information to the recipient be sent. In the event that the package information correctly has the sender put in the middle., the sender re-send the information.