A turbocharger is a device used in internal combustion engines to increase their efficiency and output. By using the exhaust gases produced by the engine, it forces more air into the cylinders, allowing for a greater amount of fuel to be burned. This results in a boost in power and torque, making the engine perform better without needing to increase its size. The process involves a rotating turbine driven by exhaust gases that spins a compressor wheel, which draws in and compresses more air to the combustion chambers. Turbocharging can significantly improve the performance and response of an engine, making it a popular enhancement for both everyday vehicles and high-performance cars.