👉 Disc fluid, also known as synovial fluid, is a viscous, lubricating liquid that fills the spaces between the articular cartilage surfaces of synovial joints. It serves multiple crucial functions: it reduces friction between the joint surfaces during movement, distributes nutrients to the cartilage, and acts as a shock absorber, protecting the joint from wear and tear. Composed primarily of water, proteins, and hyaluronic acid, disc fluid maintains joint health and facilitates smooth, pain-free motion.