An autonomous car is a vehicle capable of sensing its environment and operating without human involvement. It is not required to take control of the vehicle at any time, nor is a human passenger required to be present in the vehicle at all.

An unmanned car, also known as an autonomous car or a self-driving car, is a vehicle that can operate and navigate without a human driver. These cars are equipped with advanced sensors and computer systems that allow them to sense their environment, interpret data, and make decisions about how to operate the vehicle.

Autonomous cars use a variety of sensors, including cameras, radar, and lidar, to gather information about their surroundings. They also use sophisticated software algorithms to process this data and make decisions about how to navigate the vehicle.

The goal of unmanned cars is to increase safety, reduce traffic congestion, and improve mobility for people who are unable to drive due to disability or other factors. However, there are still many technical and regulatory challenges to overcome before autonomous cars can become widespread on public roads.

Overall, an unmanned car is an innovative and potentially transformative technology that has the potential to revolutionize transportation in the years to come.