The brain is a complex organ that serves as the control center of the body. It is responsible for processing information, regulating bodily functions, and enabling thoughts, emotions, and memories. The brain is made up of billions of cells called neurons, which communicate with each other through electrical and chemical signals. Divided into several regions, the brain includes the cerebrum, cerebellum, and brainstem. Each region has specific functions, such as movement coordination, sensory processing, and vital life functions. The brain is protected by the skull and surrounded by cerebrospinal fluid, which helps cushion it from injury.