Describe the OSI (Open Systems Interconnection) model.

The OSI (Open Systems Interconnection) model is a conceptual framework that standardizes the functions of a network into seven layers to facilitate communication between different systems. The layers are:

1. **Physical:** Handles raw data transmission over physical media.

2. **Data Link:** Manages error detection and correction, and controls data flow.

3. **Network:** Handles routing and forwarding of data packets.

4. **Transport:** Ensures reliable data transfer and error recovery.

5. **Session:** Manages sessions and controls dialogues between applications.

6. **Presentation:** Translates data formats and encryption for application layer.

7. **Application:** Provides network services and interfaces for applications.