White matter refers to a type of brain tissue that is primarily composed of myelinated axons. Myelin is a fatty substance that insulates nerve fibers and helps speed up electrical signals traveling along them. White matter plays an important role in connecting different areas of the brain, allowing for efficient communication between various regions. It is found mainly in the deep white matter structures such as the corona radiata, internal capsule, and optic radiation. In contrast to white matter, gray matter consists primarily of neuronal cell bodies and unmyelinated axons.