"Continual" means something is reoccurring. Examples: 1) The continual attacks on the poor led to a revolution. 2) He continually arrives to school late. "Continuous" means something is happening without interruption. Examples: 1) He caught the ball, turned around, and threw it all in one smooth, continuous motion. 2) The continuous sound of the waterfall can be heard from a mile away. 3) She has been continuously sending emails since this morning.