What are cerebrospinal fluid? What are it's functions?

Explanation

The brain is suspended in a special fluid environment called cerebrospinal fluid (CSF).
Functions:
(i) It acts as a shock absorbing fluid and protects the brain from damage, when it is subjected to sudden jerk.
(ii) It supplies nutrients to the brain.
(iii) It collects and removes wastes from the brain.
(iv) It is responsible for maintaining a constant pressure inside the cranium.