A wave is a type of motion or disturbance that travels through space and matter. The term 'wave' can refer to several different types of waves, including SINE waves, which are characterized by smooth, repetitive oscillations; TIDAL waves, which are caused by the gravitational pull of the moon and sun; HEAT waves, which are caused by the transfer of thermal energy; CREST waves, which are characterized by a peak or ridge; TAT waves, which are characterized by a rapid rise and fall; FLAP waves, which are characterized by a sudden increase in amplitude; SWELL waves, which are characterized by a gradual increase in amplitude; byebye waves, which are characterized by a sudden decrease in amplitude; ROLLER waves, which are characterized by a rolling motion; and BREAKER waves, which are characterized by a breaking motion.