Packet
A self-contained bundle of data sent over a (packet-switching) network.
Packets are typically less than 1500 bytes in size and use the TCP/IP protocol.
If you have a large file to send, the file is broken into multiple packets for transmission and reassembled at the other end. It can accomplish this because each packet includes a header with “to and from” information, sequencing instructions, and error checking information, so the “puzzle pieces” can be reassembled.
If any of these packets gets delayed, however, your document cannot be reassembled and you have a packet jam.