A combustion engine is powered by a series of small explosions when fuel is ignited and burned to create energy. These explosions are noisy. The noise is directed through a "muffler," which does just that: muffles the noise so that the public is not overwhelmed by the constant noise of thousands of cars that pass by each day.
The tailpipe allows exhaust to leave the engine after the fuel has been burned in an explosion, which powers the vehicle. The noise also leaves the tailpipe. The muffler "muffles" the noise.
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