A backrest on a motorcycle is an accessory designed to provide additional comfort and support for the rider or passenger. Typically mounted on the rear of the seat or integrated into the pillion seat, the backrest offers lumbar support and helps reduce fatigue on long rides. It can be adjustable or fixed and is often padded for added comfort. The backrest enhances the riding experience by improving posture and stability, especially for passengers, and can also contribute to a more relaxed and enjoyable journey.