The application layer is a layer in the Open Systems Interconnection (OSI) seven-layer model and in the TCP/IP suite that specifies the shared communications protocols and interface methods used by hosts in a communications network. It consists of protocols that focus on process-to-process communication across an IP network and provides a firm communication interface and end-user services.

Some Application Layer Protocols include:

HTTP
FTP
SMTP
DNS
SSH

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Application Layer Protocols

See also