Guided media
With computer networking and telecommunications, guided media describes any medium where a signal is transmitted over a physical path. For example, a coaxial cable, Ethernet cable, fiber-optic cable, and twisted-pair cable are all examples of guided media, where the signals are transmitted over a physical line.
The term guided media is used to help differentiate between unguided media, where a signal is transmitted through the air or a vacuum.
What are the advantages of guided media?
The advantages guided media has over unguided media include reliability and security. Because guided media is transmitted over a line, it can be more reliable and less likely to encounter interference. Guided media is also more secure because it's more difficult to intercept a signal being transmitted over a line than a signal being transmitted over the air.