Application layer

nouncandidate·updated May 9, 2026

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In the Open Systems Interconnection (OSI) communications model, the application layer provides services for an application program to ensure that effective communication with another application program in a network is possible. Scope Note: The application layer is not the application that is doing the communication; a service layer that provides these services.

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§1: In the Open Systems Interconnection (OSI) communications model, the application layer provides services for an application program to ensure that effective communication with another application program in a network is possible. Scope Note: The application layer is not the application that is doing the communication; a service layer that provides these services.