The Physical Layer, one of the five layers in the TCP/IP 5 Layer Model, represents the physical devices that interconnect devices.
Most of the time, physical layer devices consist of cables and connectors. In some ways, the physical layer of our network stack model is the most complex. Its main focus is on moving ones and zeros from one end of the link to the next. But, very complicated mathematics, physics, and electrical engineering principles are at play to transmit huge volumes of data across tiny wires at incredible speeds.
Examples of the physical layer include, cabling, connectors, signals, 10Base T and 802.11.
