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The OSI model is divided in seven layers. These layers have been arranged in two groups. Top three layers define how the applications in the computers will communicate in with each other or with users. The bottom four layers define how the data is transmitted from one end to another.
| Application |
| Presentation |
| Session |
| Transport |
| Network |
| Data Link |
| Physical |
Application |
Presentation |
Session |
| Transport |
| Network |
| Data Link |
| Physical |
The OSI reference model = Top 3 Layers + Bottom 4 Layers
Application Layer
It is the layer where users actually communicate to the computer system. Applications access the network services using defined procedures in this layer. The application layer is used to define the applications that handle file transfers, network management, terminal sessions, and message exchange etc.
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