An airbag is a safety device in vehicles designed to inflate rapidly during a collision. It acts as a cushion to protect passengers from hitting hard surfaces inside the car, such as the steering wheel or dashboard. Airbags are typically located in the front, sides, and sometimes even the rear of the vehicle. When a crash occurs, sensors detect the impact and trigger the airbag to deploy within milliseconds. The airbag is made of a strong fabric and is filled with gas, allowing it to expand quickly. This technology is part of a broader safety system that includes seatbelts and crumple zones to enhance passenger protection.