Difference between UDP and PDU

Answer 1

PDU

Information that is delivered as a unit among peer entities of a network and that may contain control information, address information, or data.

UPD

The User Datagram Protocol (UDP) is one of the core members of the internet Protocol Suite, the set of network protocols used for the Internet. With UDP, computer applications can send messages, in this case referred to as datagrams, to other hosts on an Internet Protocol (IP) network without requiring prior communications to set up special transmission channels or data paths