TCP (Transmission Control Protocol):TCP (Transmission control protocol) is a connection-oriented reliable transport protocol. It provides a process to process communications using port numbers. It provides services like flow control, error control, congestion control. A packet that is sent is known as a segment in TCP.In TCP, transmission requires three phases: connection establishment, data transfer, and connection termination. It uses three-way handshaking mechanism for connection establishment and termination. UDP (User datagram protocol):UDP (User datagram protocol) is called a connectionless, unreliable transport protocol.It does not add anything to the services of IP except providing a process to process communication.There is no flow control, error control and congestion control mechanism in UDP. To send a message from one process to another,UDP protocol encapsulates and decapsulates messages in an IP datagram.