A shoulder rest is a device used by string instrument players, such as 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. They can be adjusted for height and angle, ensuring a proper fit for the player. Using a shoulder rest can enhance overall playing technique and improve sound quality.