The engine cycle refers to the series of processes that an internal combustion engine undergoes to convert fuel into mechanical energy. This cycle typically includes four main strokes: intake, compression, power, and exhaust. During the intake stroke, the engine draws in a mixture of air and fuel. The compression stroke then compresses this mixture, preparing it for ignition. Once compressed, the fuel-air mixture is ignited, causing a power stroke that pushes the piston down, generating energy. Finally, the exhaust stroke expels the burnt gases from the cylinder, allowing the cycle to repeat. This process is fundamental to the operation of vehicles powered by internal combustion engines.