Transmission Control Protocol (TCP) is one of the core protocols of the Internet Protocol (IP) suite, and is responsible for ensuring reliable delivery of data across the network. It is a connection-oriented protocol, meaning that a virtual connection between two devices must be established before data can be transmitted.
TCP provides a number of important functions, including:
Reliable data transmission: TCP provides reliable data transmission by using a flow control mechanism to regulate the amount of data that can be transmitted at any given time, and by using error detection and correction mechanisms to ensure that the data arrives at its destination intact.
Flow control: TCP uses a sliding window mechanism to regulate the amount of data that can be transmitted, and to ensure that the receiving device is not overwhelmed with data.
Error detection and correction: TCP uses a checksum mechanism to detect errors in the data transmission, and to request retransmission of any data that is found to be corrupted.
Ordering of data: TCP ensures that data is transmitted and received in the correct order, so that the receiving device can correctly reassemble the original message.
TCP is used by many applications, including email, file transfers, and the World Wide Web (WWW). It is widely used because of its reliable and efficient data transmission capabilities, and because it provides a standardized interface for applications to communicate over the network.