The bone known as the collarbone is called the clavicle. The clavicle is a long, thin bone located horizontally between the breastbone (sternum) and the shoulder blade (scapula). It plays a critical role in stabilizing the shoulder and providing structural support for the upper limb. The clavicle also allows for a full range of motion, enabling the arms to move freely while protecting vital structures beneath it. It is one of the most commonly fractured bones, often due to falls or accidents. The clavicle's unique anatomical position makes it essential for various arm movements and overall shoulder function.