Autonomous cars refer to vehicles that are capable of driving themselves without any human intervention. These cars use advanced technologies such as sensors, cameras, radar systems and artificial intelligence algorithms to navigate roads, avoid obstacles, follow traffic rules and make decisions in real-time. They can be controlled remotely or operate on predefined routes with the help of GPS navigation system. Autonomous cars have the potential to revolutionize transportation by reducing accidents caused by human error, improving fuel efficiency, and enhancing overall road safety.