Why should we care about the OSI Reference Model ? What is the main purpose for creating this osi model? why it is a layered model?

OSI (Open Systems Interconnection) is a standard description or "reference model" for how messages should be transmitted between any two points in a telecommunication network. Its purpose is to guide product implementors so that their products will consistently work with other products. The reference model defines seven layers of functions that take place at each end of a communication; they are

1. Application layer
2. Presentation layer
3. Session layer
4. Transport layer
5. Network layer
6. Datalink layer
7. Physical layer.

OSI has two major components:

• an abstract model of networking, called the Basic Reference Model or seven-layer model,
• a set of specific protocols.