Self-driving cars are designed to "see" the world around them using a special kind of eye called a sensor. These sensors can detect different things like cars, people, trees, and traffic lights.

The sensors work by sending out signals that bounce off objects in the car's environment and return to the sensor. The car's computer then uses this information to create a picture of what's around the car.

The computer has been programmed to recognize certain shapes and patterns, like the shape of a person or a stop sign. It knows what these things look like and can identify them based on their shape and other features.

So, just like how we can recognize our friends by their faces or our toys by their shapes, self-driving cars can recognize objects based on their shape and other characteristics. And that's how a self-driving car can know what something is without having a brain like we do.
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