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 other hard surfaces inside the vehicle. These airbags are typically made of lightweight fabric and inflate quickly upon impact. They work in conjunction with other safety systems, such as side airbags and seatbelts, to enhance overall passenger protection. By providing additional coverage, curtain airbags significantly reduce the risk of serious head injuries in accidents.