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A four-stroke engine is an internal combustion engine that completes its power cycle in four distinct stages: intake, compression, power, and exhaust. The process begins with the intake stroke where a mixture of air and fuel enters the cylinder, followed by the compression stroke during which the mixture is compressed and then ignited in the power stroke. Finally, the exhaust stroke expels the burnt gases from the engine. This engine type is commonly found in automobiles and motorcycles due to its efficiency and performance.