The periodontal ligament is a group of connective tissues that attach the tooth to the jawbone. It plays a crucial role in supporting the tooth and absorbing the forces generated during chewing. This ligament contains various cells, fibers, and blood vessels that help maintain the health of the surrounding structures. Additionally, the periodontal ligament is involved in the process of tooth movement, such as during orthodontic treatment. It helps in the remodeling of the alveolar bone and can respond to changes in pressure, allowing for adjustments in the position of the tooth over time.