It interprets visual information
Our brains constantly take in loads of visual data, thanks to our eyes. As light passes through the cornea, the clear, dome-like surface that covers the eye, that light is bent. The iris, the colored part that changes the size of the pupil, controls how much light enters the eye, and then the lens focuses the remaining light onto the retina. The retina then converts that light into electrical signals that travel from the eye to the brain for interpretation. This process may take a paragraph to explain, but it happens in milliseconds, allowing the brain to process a whopping 600 million bits of visual information in just one minute.
It sends nerve impulses
A single neuron can send as many as 1,000 nerve impulses every second (or 60,000 per minute). A healthy human brain has about 200 billion neurons. That adds up to 12,000,000,000,000,000 signals being sent throughout your brain.