The brain (latin: Cerebrum) is controlling the human body and together with the spinal cord make up the central nervous system. It is protected by the bones of the head.
From the rational view, it contains mostly everything which makes a human, e.g. knowledge, intelligence, behavior, character, soul, etc. Except for the genes there is no other location identified, even when we still don't know, where and how the intelligence and a character or even the soul is located and stored.