Packet
In plain terms
A small unit of data transmitted over a network.
Going deeper
Networks break data into packets, each with headers (addresses, sequence) and a payload, routed independently and reassembled. It's the fundamental unit of network transfer.
Under the hood
Independent routing enables resilience; TCP reorders and retransmits lost packets, UDP doesn't.
Examples
IP packets, network transmission, packet loss, headers, routing.
Think of it like...
Like splitting a long letter into numbered postcards mailed separately and reassembled.