Explanation:
The OSI (Open Systems Interconnection) model is a conceptual model that characterizes and standardizes the communication functions of a telecommunication or computing system without regard to its underlying internal structure and technology. The OSI model has seven layers, each of which represents a specific function in network communication. These layers are:

1. Physical Layer
2. Data Link Layer
3. Network Layer
4. Transport Layer
5. Session Layer
6. Presentation Layer
7. Application Layer

Physical Layer:
The physical layer is the lowest layer of the OSI model. This layer is responsible for the transmission and reception of unstructured raw data between a device and a physical transmission medium. The physical layer defines the electrical and physical specifications of the data connection, including the cable types, connector types, and signals that are used to transmit data.

Data Link Layer:
The data link layer is the second layer of the OSI model. This layer is responsible for the reliable transfer of data between two devices on the same network. The data link layer is divided into two sublayers:

1. Logical Link Control (LLC)
2. Media Access Control (MAC)

The LLC sublayer is responsible for the flow control and error checking of data, while the MAC sublayer is responsible for the access to the transmission medium.

Error Detection:
The physical layer of the OSI model can use the trailer of the frame for error detection. A trailer is an additional piece of data that is added to the end of a data packet. The trailer contains information that can be used to check the integrity of the data packet during transmission. When a device receives a data packet, it checks the trailer to ensure that the data packet was received without errors.

Conclusion:
In conclusion, the physical layer of the OSI model is responsible for the transmission and reception of unstructured raw data between a device and a physical transmission medium. The physical layer can use the trailer of the frame for error detection.