| Layer 6 of the Open System Interconnection (OSI) reference model. This layer ensures that information sent by the application layer of one system will be readable by the application layer of another. The presentation layer is also concerned with the data structures used by programs and therefore negotiates data transfer syntax for the application layer. Corresponds roughly with the presentation services layer of the Systems Network Architecture (SNA) model. See also application layer, data link layer, network layer, physical layer, session layer, and transport layer. |