SSB VS DSB :-

SSB : In radio communications, single-sideband modulation or single-sideband suppressed-carrier modulation is a type of modulation used to transmit information, such as an audio signal, by radio waves. A refinement of amplitude modulation, it uses transmitter power and bandwidth more efficiently. 

SSB : Double-sideband suppressed-carrier transmission is transmission in which frequencies produced by amplitude modulation are symmetrically spaced above and below the carrier frequency and the carrier level is reduced to the lowest practical level, ideally being completely suppressed.