Application Layer Connects an application or program to a communications protocol
Application This layer supports application and end-user processes. Communication partners are identified, quality of service is identified, user authentication and privacy are considered, and any constraints on data syntax are identified. Everything at this layer is application-specific. This layer provides application services for file transfers, e-mail, and other network software services. Telnet and FTP are applications that exist entirely in the application level. Tiered application architectures are part of this layer. TDI ASCII EBCDIC MIDI MPEG SMB HTTP SMTP SNMP FTP Telnet NFS NTP
The seventh, or application, layer of the open systems interconnection (OSI) model. It defines the services that directly support applications such as software for network management, electronic mail or file transfers.
In the (OSI) model, the application layer which contains the user applications. The application layer is the interface between the user and the communications technology.