The sternum, commonly known as the breastbone, is a flat bone located in the center of the chest. It connects to the ribs via cartilage, forming part of the rib cage, which protects vital organs like the heart and lungs. The sternum has three main parts: the manubrium, body, and xiphoid process, each playing a role in providing structure and support to the upper body. In addition to its protective function, the sternum serves as an attachment point for several muscles, including those involved in breathing, such as the pectoralis major. This bone is crucial for maintaining the integrity of the thoracic cavity and supporting overall posture.