A booster seat is a type of child safety restraint that is designed to help position children properly in vehicles for improved safety during transport. It typically consists of a raised platform with a backrest and armrests, which elevates the child so they can see out of the windows and reach the pedals comfortably. Booster seats are used for children who have outgrown standard car seats but are not yet large enough to use adult seat belts safely. They provide additional height and support to help secure children in their vehicles, reducing the risk of injury or death during accidents or sudden stops.