A shoulder rest is a device used by string players, particularly those who play the violin or viola. It is designed to provide support and comfort by resting against the shoulder and the instrument, helping to stabilize the instrument while playing. This allows musicians to maintain better posture and reduces strain on the neck and shoulder. Shoulder rests come in various shapes, sizes, and materials, catering to individual preferences and playing styles. Some are adjustable, allowing players to customize the height and angle for optimal comfort. Using a shoulder rest can enhance overall playing technique and improve sound quality by allowing for better instrument control.