How many layers are there in the OSI model?

The OSI (Open Systems Interconnection) model comprises seven distinct layers, each serving a specific function in the process of computer networking. These layers are:

1. Physical Layer: This layer deals with the physical connections between devices and the transmission of raw binary data over a medium. It includes hardware elements like cables and switches.

2. Data Link Layer: This layer is responsible for establishing and maintaining a link between devices over the physical layer. It handles error detection and correction as well as framing data packets for transmission.

3. Network Layer: The primary function of this layer is to determine how data is sent from source to destination across multiple networks. It manages addressing, routing, and forwarding.

4. Transport Layer: This layer ensures complete data transfer and provides error recovery and flow control. It segments the data into smaller packets for transmission and reassembles them at the destination.

5. Session Layer: The session layer manages sessions between applications. It establishes, maintains, and terminates connections and controls the dialogues (connections) between systems.

6. Presentation Layer: This layer translates data between a networking service and an application. It formats data as needed for the application or end-user and handles encryption