The application layer, the highest layer in the TCP/IP model, is responsible for providing the applications running on a computer with access to the network. It is the layer that applications use to send and receive data over a network, and it provides the services that applications need to communicate with each other, such as file transfer, email, and web browsing.
The application layer is important because it allows applications to communicate with each other over a network. Without the application layer, applications would not be able to send and receive data over a network, and they would not be able to communicate with each other. The application layer also provides a number of benefits, such as: