An autonomous car uses sensors like LIDAR, RADAR, cameras and ultrasonic sensors to navigate without human input. It has two seats and drives at the speed limit while maintaining a safe distance from other vehicles. LIDAR uses lasers to generate 3D maps of the environment while RADAR detects objects' speeds and positions using radio waves. Autonomous cars aim to minimize accidents by removing human error from driving and allow disabled people to drive. However, they have disadvantages like inability to handle heavy weather, slow speeds at intersections, high costs, and potential for system failures.