Application Protocol Data Unit

<networking> (APDU) A packet of data exchanged between two application programs across a network.

This is the highest level view of communication in the OSI seven layer model and a single packet exchanged at this level may actually be transmitted as several packets at a lower layer as well as having extra information (headers) added for routing etc.

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application layer
Application Portability Architecture
application program
Application Program Interface
Application Programming Interface
Application Service Element
Applications Development Manager
application server
Application Service Element
application service provider
applications language