Turbo is a device that makes engines more powerful by forcing extra air into them. The word is short for turbocharger. Think of it like this: an engine is like a person breathing. The more air you can get in, the harder you can work. A turbo uses the engine's own exhaust gases (the hot gases coming out) to spin a fan that pushes more fresh air back into the engine, making it burn fuel more efficiently and produce more power.

Race cars often use turbos to go faster without making the engine bigger or heavier. Many airplane engines have turbos too, which helps them work better at high altitudes where the air is thin. You might see a car with a “turbo” badge, which means it has this special power-boosting technology.

People also use turbo informally as an adjective to mean super-fast or powered-up versions of things. A “turbo mode” in a video game might make your character faster. When someone says they're going “full turbo” on a project, they mean they're working at maximum speed and intensity. The word has become synonymous with speed, power, and enhanced performance, whether you're talking about actual engines or just about putting extra energy into whatever you're doing.