The coccyx, commonly known as the tailbone, is a small, triangular bone located at the base of the spine. It consists of three to five fused vertebrae and serves as an attachment point for various muscles, tendons, and ligaments. The coccyx plays a role in supporting the body when sitting and helps maintain balance. In humans, the coccyx is a remnant of a tail that is present in some other animals. While it is not essential for movement, injuries to the coccyx can cause pain, known as coccydynia, which may require medical attention.