The rotator cuff is a group of four muscles and their tendons that surround the shoulder joint. These muscles, known as the supraspinatus, infraspinatus, teres minor, and subscapularis, work together to stabilize the shoulder and allow for a wide range of arm movements. This makes the rotator cuff essential for activities like throwing, lifting, and reaching. Injuries to the rotator cuff are common, especially among athletes and older adults. Such injuries can lead to pain, weakness, and limited mobility in the shoulder. Treatment options often include physical therapy, rest, and in some cases, surgery to repair any tears or damage to the tendons.