A reciprocating engine is a type of engine that converts fuel into mechanical energy through the back-and-forth motion of pistons. These pistons move inside cylinders, and as they move up and down, they create power that can be used to drive vehicles or generate electricity. This engine type is commonly found in cars, motorcycles, and small aircraft. The operation of a reciprocating engine involves several key processes, including intake, compression, power, and exhaust. During these stages, the engine draws in air and fuel, compresses the mixture, ignites it to produce power, and then expels the exhaust gases. This efficient cycle is what makes reciprocating engines popular in many applications, from automobiles to generators.