a Network Protocol used to provide non-guaranteed, connectionless data transport for communicating devices
Anything that relies on lowest possible latency despite loss relies on UDP.
Exists in Transport Layer
It has a Checksum. Besides that, no guarantees, unlike TCP
Datagram
Creates a “datagram” is the PDU created by UDP, and includes a UDP Header
UDP Header
a 4-field, 8-byte header containing connection and payload delivery details for a datagram. A UDP header is used to provide best-effort payload delivery.