Cerebrospinal fluid (CSF) is a clear, colorless body fluid found within the tissues that surround the brain and spinal cord of all vertebrates. It is produced by the choroid plexus in the ventricles of the brain and serves several critical functions, including cushioning the brain within the skull, serving as a shock absorber for the central nervous system, and circulating nutrients and chemicals filtered from the blood. Additionally, it removes waste products from the brain.