Meaning: A naturally aspirated engine takes in air to mix with fuel and create combustion on its own. Supercharged engines use some kind of compressor to force additional air into the engine. Turbochargers are technically a specific type of supercharger -- one that uses an exhaust-driven turbine to force more air into the engine. (Strictly speaking, when most people talk about superchargers, they're talking about mechanically-driven compressors.) Using super- and turbochargers on smaller engines allows you to extract greater performance from a smaller (and usually lighter) engine.