Connectionless protocols

Connectionless protocols do not establish an end-to-end logical connection. Instead, each packet contains the destination address of the receiver, and is thus treated as an individual entity. Unlike connection-oriented protocols, packets do not follow the same route, thus the packets do not reach the receiver in the order that they were delivered. Just because of that, connectionless protocols use the packet switching method for data transmission and are known to be the best effort network services. An example of connectionless protocols would be the postal office system, where each letter contains a destination address. The most known connectionless protocol is the User Datagram Protocol (UDP).