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the human brain is perhaps the most complex of organs boasting in about 60-100 billion nerve cells or neurons the  interact with each other. These neurons 'carry' messages through electrochemical processes; meaning, chemicals in our body (charged sodium, potassium and chloride ions) move in and out of these cells and establish an electrical current.
To make it simple, the human brain acts like your CPU that tells you what to do. It also processes all of the things you do out of what you have learned. There are other things that a brain can do like simulating voluntary movements like walking and dancing.