Curtain airbags are safety features in vehicles designed to protect passengers' heads during a side-impact collision. They deploy from the roof area of the car, creating a cushion that helps prevent injuries from hitting the side windows or the vehicle's interior. These airbags are typically made of fabric and inflate quickly in the event of an accident. They work alongside other safety systems, such as side airbags and seat belts, to enhance overall passenger protection. Curtain airbags are especially important for preventing serious head injuries, making them a crucial component of modern vehicle safety design.