Packet

Packet is a term first coined by Donald Davies in 1965 that describes a segment of data sent from one computer or device to another over a network. You can think of it as a package with data delivered to another area. A packet is used because it divides data into easier-to-manage "chunks," which move information more efficiently and keep network resources from being tied up by a single, larger file.

What is in a packet?

A packet contains a source, destination, data, size, and other useful information that helps the packet reach the appropriate location and get reassembled properly. Below is a breakdown of a TCP (Transmission Control Protocol) packet.

Network packet basics

• Another name for a packet is a datagram.
• Data transferred over the Internet is sent as one or more packets. The most common packet sent is the TCP packet.
• The size of a packet is limited, so most data sent over a network is broken up into multiple packets before being sent and then put back together when received.
• Network routers and switches examine the packet and its source to help direct it to the correct location when a packet is transmitted over a network.
• During its transmission, network packets can be dropped. If a packet is not received or an error occurs, it is sent again.

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