The **hill start assist system**, known as **Hill Holder**, is a device that facilitates the vehicle's start on a steep slope. Its main function is to prevent the car from rolling backward when the driver switches their foot from the brake to the accelerator. This is especially useful in situations where the terrain is inclined, providing safety and comfort to the driver when starting off.

This system is different from other assistance systems, such as the **Start-stop**, which automatically turns the engine off and on to save fuel, or the **ESP** (Electronic Stability Program), which helps maintain vehicle control in situations of traction loss. Therefore, the Hill Holder is the specific system designed to assist with hill starts.