OSI Model Layer 7 – Application Layer

“An application layer is an abstraction layer that specifies the shared protocols and interface methods used by hosts in a communications network. The application layer abstraction is used in both of the standard models of computer networking: the Internet Protocol Suite (TCP/IP) and the Open Systems Interconnection model (OSI model).”  Quote Source: wikipedia

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Source: Application layer – Wikipedia

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OSI Model Layer 6 – Presentation Layer

“The presentation layer is responsible for the delivery and formatting of information to the application layer for further processing or display.[4] It relieves the application layer of concern regarding syntactical differences in data representation within the end-user systems. An example of a presentation service would be the conversion of an EBCDIC-coded text computer file to an ASCII-coded file.”  Quote Source: wikipedia

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Source: Presentation layer – Wikipedia

OSI Model Layer 5 – Session Layer

“The session layer provides the mechanism for opening, closing and managing a session between end-user application processes, i.e., a semi-permanent dialogue. Communication sessions consist of requests and responses that occur between applications.Session-layer services are commonly used in application environments that make use of remote procedure calls (RPCs).” Quote Source: wikipedia

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networkingSource: Session layer – Wikipedia