Restraint systems are safety features designed to protect occupants in vehicles during collisions. They include components like seat belts, airbags, and child safety seats, which work together to minimize injury by securing passengers in place and absorbing impact forces. These systems are crucial for enhancing vehicle safety and are often subject to strict regulations and testing. Organizations such as the National Highway Traffic Safety Administration (NHTSA) evaluate and rate the effectiveness of restraint systems to ensure they meet safety standards and provide optimal protection for all passengers.