Driverless cars are cars that do not need a human driver. They use computers and sensors to drive around by themselves. They can "see" the world around them and figure out the best route to take to get to where they need to go. They can avoid obstacles, follow the rules of the road, and even park themselves. Driverless cars are becoming more popular because they are safer than cars with human drivers, since they don't need to make mistakes that could cause accidents.