Do you know anything about manual transmissions?
The simplest way I can describe it, is your engine and your wheels turn at different speeds from each other depending on the gear. Your engine makes more power at *high* RPM, but it burns less fuel at *low* RPM.
Paddle shifters just electronically change the gear your car is in, instead of using a gear stick and clutch like a manual transmission.
Low gears let the engine spin at high RPM, but the wheels turn slower. (so you get more power to get the care moving from a stop).
Higher gears make the engine spin at lower RPM, but the wheels turn faster with each gear (so the car can cruise at higher and higher speed, but the engine can stay at low RPM to safe fuel)
Edit: Here’s a good (https://youtu.be/txQs3x-UN34) demonstrating gears with Lego.
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