The Open Systems Interconnection (OSI) Reference Model is a conceptual framework developed by the International Organization for Standardization (ISO) to standardize communication between different computer systems and networks. It divides the communication process into seven distinct layers, where each layer performs specific functions and communicates with the layers directly above and below it. The OSI model provides a universal language for network communication, enabling interoperability among devices and protocols from different manufacturers. It is widely used for understanding, designing, troubleshooting, and securing computer networks and cyberspace technologies. The first layer is the Physical Layer. It is responsible for the transmission of raw binary data over physical communication media such as cables, fiber optics, or wireless signals. This layer defines electrical signals, voltage levels, connectors, transmission speed, modulation techniques, and data rates. Devices such as hubs, repeaters, network cables, switches operating at the physical level, and wireless transmitters are associated with this layer. The Physical Layer ensures that bits are transmitted accurately from one device to another. The second layer is the Data Link Layer. It provides reliable data transfer between directly connected devices by organizing raw