Cerebrospinal fluid (CSF) is a clear fluid that surrounds the brain and spinal cord, serving several important functions in the central nervous system. CSF acts as a cushion for the brain, protecting it from trauma and providing buoyancy. It also helps to remove waste products and regulate the chemical environment in the brain. CSF is produced in the ventricles of the brain and circulates around the brain and spinal cord before being reabsorbed into the bloodstream. Abnormalities in CSF composition can be indicative of neurological disorders such as meningitis, multiple sclerosis, or Alzheimer's disease. Researchers study CSF to better understand the brain and its function, as well as to develop diagnostic tools and potential treatments for neurological diseases.