Hi all. Can somone explain me the difference between "soliton" and those "normal waves" i learn in highschool physics? I can't really distinguish between them. While a soliton travel at a constant shape and velocity, doesn't the same apply to normal waves? That two solitons collide and retore theirs own shapes afterwards, doesn't this apply to normal waves? the principle of superposition? I know there will be phase different introduction in the collision of solitons. But why are solitons so special? Find kindly explain.