Can you explain what the OSI model is and how it is structured?

The OSI (Open Systems Interconnection) model is a reference network model that describes how data is transmitted over a network through seven layers. It helps standardize interaction between different systems.

Structure of the OSI model:

1. Physical Layer — transmission of bits over physical channels (cables, radio signals).
2. Data Link Layer — organization of frame transmission, error detection and correction at the physical layer.
3. Network Layer — routing of packets between network nodes (e.g., IP).
4. Transport Layer — ensuring reliable data transfer, flow control, and error management (TCP, UDP).
5. Session Layer — management of communication sessions, establishing and terminating connections.
6. Presentation Layer — data transformation, encoding, encryption.
7. Application Layer — interaction with applications and users (HTTP, FTP, SMTP).

Each layer performs its functions and interacts with neighboring layers, providing comprehensive data transfer over the network.