The term for the fluid that surrounds and cushions cells is extracellular matrix (ECM). The ECM is a complex network of proteins, glycoproteins, and polysaccharides that provide structural and biochemical support to surrounding cells. It plays a crucial role in tissue development, repair, and cellular communication. Furthermore, the ECM aids in regulating various cellular functions, including growth, migration, and differentiation, making it essential for maintaining the integrity of tissues and organs.