A Hans device is like a special collar that race car drivers wear to protect their necks. Imagine you are playing with a toy car and you crash it into a wall. Your head might jerk forward and backward really quick, making your neck hurt. When race car drivers go fast and then suddenly stop, their heads can whip forward and backward too. This can hurt their necks a lot, and even cause a serious injury called whiplash.
The Hans device is shaped like a U and sits over the driver's shoulders. It attaches to the helmet they wear and the car seat behind them. So, if the driver's car stops suddenly, the Hans device will stop their head and neck from moving too much. This keeps the driver's neck safe and helps prevent injuries. Race car drivers wear a lot of safety gear like helmets, gloves, and fire-resistant suits, and the Hans device is an important part of that gear.