As we know that both TCP (Transmission Control Protocol) and UDP (User Datagram Protocol) are the most widely used Internet protocols among which TCP is connection oriented − once a connection is established, data can be sent bidirectional. TCP is a connection-oriented protocol. What is UDP? User Datagram Protocol (UDP) is a connectionless protocol that works just like TCP but assumes that error-checking and recovery. KEY DIFFERENCES: · TCP is a connection-oriented protocol, whereas UDP is a connectionless protocol. Explains the basics of transport protocols and compares the two major options: UDP and TCP. What's the difference between TCP and UDP? There are two types of Internet Protocol (IP) traffic.