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{{refimprove|date=April 2012}}
[[Image:Pdu and sdu.svg|thumb|350px|[[Medium access control]] (MAC) layer protocol data unit (PDU) becomes [[physical layer]] [[service data unit]] (SDU).]]▼
▲sdu.svg|thumb|350px|[[Medium access control]] (MAC) layer protocol data unit (PDU) becomes [[physical layer]] [[service data unit]] (SDU).]]
In [[telecommunication]]s, a '''protocol data unit''' ('''PDU''') is a single unit of information transmitted among peer entities of a [[computer network]]. A PDU is composed of protocol-specific control information and [[Payload (computing)|user data]]. In the layered architectures of [[communication protocol]] stacks, each layer implements protocols tailored to the specific type or mode of data exchange.
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