In data communication, a transmission media in computer networks is a physical path through which transmitter(sender) transmits the data to receiver i.e; a channel through which data is sent.
Transmission media in computer networks are directly controlled by the physical layer and located below the physical layer.
Data is represented by a signal used for communication. These signal are transmitted in the form of electromagnetic energy from one device to another.
Signals are typically imposed on a wave of some kind suitable for the chosen medium. For example, data can modulate sound and a transmission medium for sounds may be air, but solids and liquids may also act as the transmission medium. Vacuum or air constitutes a good transmission medium for electromagnetic waves such as light and radio waves. – Wikipedia
Electromagnetic energy is a combination of magnetic electric fields vibrating in relation to each other, includes infrared light, visible light, ultraviolet light, power, radio waves, and X, gamma, and cosmic rays.
Types of Transmission Media
Guided/wired transmission media – Read More
Unguided transmission media – Read More