The human brain is the central organ of the human nervous system. It combines with the spinal cord to form the central nervous system of the human body. The human brain consists of three parts called the cerebrum, brainstem and cerebellum. The human brain is a highly complex and abstract mechanism. The cortex includes 100 billion neurons and around 1012 synapses per cubic cm. Talking, breathing, hearing, seeing, walking, imagining, thinking, smiling, touching, experiencing, smelling, learning, making decisions, and monitoring are all functions that our brain performs simultaneously. Such tasks necessitate the use of a lot of processing.