In telecommunications, broadband is wide bandwidth data transmission that transports multiple signals and traffic types. The medium can be co-axial cables, optical fiber, radio, or twisted pair.
In the context of internet access, it is referred to as high-speed internet access that is always on and faster. A broadband signaling method is one that handles a wide band of frequencies. The wider the bandwidth of the channel, the more the data-carrying capacity, if the channel quality is the same.