A booster seat is a type of child safety seat designed to elevate a child so that the vehicle's seat belt fits properly. It is typically used for children who have outgrown their forward-facing car seats but are still too small to use the seat belt alone. Booster seats help ensure that the lap and shoulder belts are positioned correctly over the child's body, providing better protection in the event of a crash. Booster seats come in two main types: high-back and backless. High-back booster seats provide head and neck support, making them suitable for vehicles without headrests. Backless booster seats are more portable and easier to store but require the vehicle to have a proper headrest. Both types are essential for keeping children safe while traveling in a car.