How many layers are defined in the OSI Model?

The OSI Model, which stands for Open Systems Interconnection Model, is structured into seven distinct layers. These layers are designed to standardize the functions of a telecommunication or computing system without regard to its underlying internal structure and technology. Each of the seven layers has specific responsibilities and interacts with the layers directly above and below it.

The seven layers are:

1. Physical Layer: Responsible for the physical connection and transmission of raw data bits over a medium.

2. Data Link Layer: Handles error detection and correction from the physical layer and manages node-to-node data transfer.

3. Network Layer: Responsible for routing data packets from one node to another across different networks.

4. Transport Layer: Ensures complete data transfer and can provide error recovery and flow control.

5. Session Layer: Manages sessions between applications for establishing, maintaining, and terminating connections.

6. Presentation Layer: Translates data between the application layer and the network format, including data encryption and compression.

7. Application Layer: This is the layer closest to the user, providing services for file transfers, email, and other network software services.

Understanding that there are exactly seven layers in the OSI Model is critical