Is a Datagram a Packet?

Datagram packets are used to implement a connectionless packet delivery service. Each message is routed from one machine to another based solely on information contained within that packet. Multiple packets sent from one machine to another might be routed differently, and might arrive in any order.

What do you mean by datagram?

Definition: A datagram is an independent, self-contained message sent over the network whose arrival, arrival time, and content are not guaranteed.

What layer is a datagram?

Protocol data units of the OSI model are: The Layer 4: transport layer PDU is the segment or the datagram.