A four-stroke engine is an internal combustion engine in which the piston completes four separate strokes while turning the crankshaft. A stroke refers to the full travel of the piston along the cylinder, in either direction. The four separate strokes are termed: Intake: Also known as induction or suction. Wikipedia

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A four-stroke engine is an internal combustion engine that completes four separate strokes to generate power.

The four strokes in a four-stroke engine are intake, compression, combustion, and exhaust.
During the intake stroke, the piston moves downward, drawing in a mixture of fuel and air into the cylinder.
In the compression stroke, the piston moves upward, compressing the fuel-air mixture.
The combustion stroke is where the spark plug ignites the compressed mixture, causing an explosion and pushing the piston downward.
Finally, in the exhaust stroke, the piston moves upward again, pushing out the exhaust gases from the cylinder.

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