The Application Layer of the OSI model:

can provide different modes of communicating, such as full duplex, half duplex, and simplex.

serves as the primary interface for application software to interact with networks.

sets up$,$ manages, and terminates connections between applications on source and destination computers.

on the sending computer, is responsible for formatting and coding high$-$level data that comes from applications into a form that is acceptable for transmitting on the network.