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Overdrive is the highest gear or set of gears in an automatic transmission, designed to reduce engine RPM at highway speeds for better fuel economy.

A healthy 12-volt car battery shows about 12.6 volts when off and 13.7 to 14.7 volts with the engine.

A modern car tune-up typically includes replacing spark plugs and filters, plus inspecting fluids, belts, and hoses per your owner’s manual.

Non-tax fees are government and dealer charges separate from sales tax, including title, registration, license plate, and documentation fees.

Idle RPM is the engine’s rotational speed, measured in revolutions per minute, when the car is stopped and the drivetrain is disengaged — for most.

Automotive night vision is a driver-assistance system that uses thermal or infrared cameras to detect pedestrians, animals.

i-Size is the European safety regulation ECE R129 for child car seats, classifying seats by height, mandating rear-facing travel until 15 months.

Neutral is a gear position that disconnects the engine from the drive wheels, allowing the car to roll freely without engine power.

A head-up display (HUD) projects key driving information, such as speed and navigation, onto the windshield.

To buy a car from a dealership, you generally need a valid driver’s license, proof of auto insurance.