What is a protocol data unit?

Explain Protocol Data Unit wrt Data Communiction?
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"A PDU is the combination of data from the next higher communications layer and control information."
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"Small intended for Standard protocol Files Device, PDU is actually details supplied by having a multilevel bed. For the system to be aware of what exactly level will be talked about, just one-mail prefix can be included with the PDU. LPDU - Communication to the data link stratum. NPDU - Communication with the net layer. TPDU - Transmission for the carry stratum"
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