Software Applications Layer. The application layer is the highest abstraction layer of the TCPIP model that provides the interfaces and protocols needed by the users. This layer is kept thin.
Layered Architecture - Software Architecture Patterns Book Chapter 1. This layer is kept thin. The BLL in turn can call the DAL for data access requests.
The application layer in the OSI model is the closest layer to the end user which means that the application layer and end user can interact directly with the software application.
The most common architecture pattern is the layered architecture pattern otherwise known as the n-tier architecture pattern. This is the first and topmost layer which is present in the application. The most widespread use of multitier architecture is the three-tier architecture. Up to 5 cash back 1.
