Side airbags are safety features in vehicles designed to protect passengers during side-impact collisions. They deploy from the side of the vehicle, typically from the door or seat, to create a cushion that reduces the risk of injury to the head and torso. These airbags work in conjunction with other safety systems, such as seat belts, to enhance overall protection. There are different types of side airbags, including thorax airbags, which protect the chest area, and curtain airbags, which extend down from the roof to shield the head. The deployment of side airbags is triggered by sensors that detect a collision, helping to minimize the impact on occupants.