A four-stroke engine is a type of internal combustion engine that completes four distinct strokes during its operating cycle: intake, compression, power, and exhaust. This process converts fuel into energy, which powers vehicles like cars and motorcycles. Each stroke corresponds to a different phase of the engine's operation, ensuring efficient energy production. In the intake stroke, air and fuel enter the cylinder. The compression stroke then compresses this mixture, followed by the power stroke, where the spark ignites the mixture, creating a force that drives the piston. Finally, the exhaust stroke expels the burnt gases, readying the engine for the next cycle.