A term coined in the 1930’s to describe a range within a band of wavelengths of the radio frequency type. Its common usage today refers to the raw carrying capacity of a transmission medium, such as copper wires, fiber-optic cable, or satellite links. The greater the bandwidth, the more information can be transmitted. Telephones which also transmit the live picture of the persons speaking require much greater bandwidth than those transmitting the voice alone.
In electronics the range of frequencies within which performance within specified limits.
The total count of cycles per unit of time, typically one second, denotes the frequency at which the electron beam can be modulated in a television camera.