Single Sideband (SSB) is a modulation technique used in radio communications. It transmits information by varying the amplitude of a carrier wave, but only one of the sidebands is sent, along with the carrier wave being suppressed. This makes SSB more efficient than traditional amplitude modulation (AM), as it uses less power and bandwidth. SSB is commonly used in amateur radio, aviation, and marine communications. By eliminating the redundant sideband, SSB allows for clearer signals over long distances, making it ideal for voice communication in situations where bandwidth is limited or where power efficiency is crucial.