Sideband

A sideband is a secondary signal that appears alongside a main signal when transmitting information, often during radio or electronic communications. It results from the modulation process, where a carrier wave (the main signal) is altered to carry information like sound or data. These sidebands contain the actual information and carry it without occupying additional bandwidth. They are essential in efficient transmission, allowing the main frequency to be used for the primary signal while sidebands carry the details. In essence, sidebands are the additional channels that help convey information within a communication system.