The back is the rear part of the human body, extending from the neck to the lower spine. It consists of various structures, including muscles, bones, and nerves, which support the body and enable movement. The spine runs through the back, providing structural support and protecting the spinal cord. The back plays a crucial role in maintaining posture and balance. It is divided into different regions: the cervical (neck), thoracic (upper back), and lumbar (lower back). Proper care, including exercise and ergonomics, is essential to prevent back pain and injuries.