The spine, also known as the vertebral column, is a flexible structure made up of individual bones called vertebrae. It extends from the base of the skull to the lower back and is divided into several regions: cervical, thoracic, lumbar, sacral, and coccygeal. The spine protects the spinal cord, which is a vital part of the nervous system, and allows for movement and support of the upper body. Each vertebra is separated by intervertebral discs, which act as cushions to absorb shock and provide flexibility. The spine also plays a crucial role in maintaining posture and balance. Proper spinal alignment is important for overall health and can prevent issues such as back pain and sciatica.