OSI model stands for Open Systems Interconnection. The seven layers of OSI model architecture starts from the Hardware Layers (Layers in Hardware Systems) to Software Layers (Layers in Software Systems) and includes the following;
1. Physical Layer
2. Data link Layer
3. Network Layer
4. Transport Layer
5. Session Layer
6. Presentation Layer
7. Application Layer
Basically, each layer has its unique functionality which is responsible for the proper functioning of the communication services.
Session layer is the layer of an Open Systems Interconnection (OSI) model which describes how data between applications is synced and recovered if messages don't arrive intact at the receiving application.
