Structural differences of two-stroke and four-stroke engine

A two-strok engine is a type of internal combustion engine which completes a power cycle with two strokes (up and down movement) of the piston during only one crankshaft revolution And A four-stroke engine is an internal combustion (IC) engine in which the piston completes four-separated stroke while turning the crankshaft. Therefore these two different engines have different structural differences.