Engines are machines designed to convert fuel into mechanical energy, powering various vehicles and equipment. The most common type, the internal combustion engine, operates by igniting a fuel-air mixture to create controlled explosions that drive pistons, ultimately turning the crankshaft and producing motion. In addition to gasoline engines, there are also diesel engines, which use compression to ignite fuel, and electric engines, which rely on electrical energy. Each type of engine has its own advantages and applications, making them essential components in transportation, industry, and even power generation.