Packet

A portion of a message that contains data and the destination address; also called a datagram. Typically located at the Network layer. Logical grouping of information that includes a header containing control information and (usually) user data. Packets are most often used to refer to network layer units of data. The terms “datagram,” “frame,” “message,” and “segment” are also used to describe logical information groupings at various layers of the OSI Reference Model and in various technology circles.