It forms the inter-fur-tebral discs
Fibrocartilage is a specialized type of cartilage found in only a few specific regions of the body: intervertebral discs, menisci of joints (like the knee joint) and the symphysis pubis of the pelvis. It is made by cartilage cells called chondrocytes (the cats pupils) that reside in lacunae (the cats eyes).
Hyaline cartilage is the more common type of cartilage in the body. Its cells synthesize cartilage that contains very fine Type II collage fibers that are not good at resisting tensile forces (regular cartilage can tear easily under this force) but creates lots of space that is occupied by loads of water making - it ideal for resisting compressive forces (you can’t easily compress water right!)
Fibrocartilage is different. It is impregnated with a a type of collagen more commonly found in strong tendons and ligaments - Type I collagen (the red/pink material that fills this image). This means that fibrocartilage is adapted to resist some compressive forces but also strong tensile forces. In other words it’s not quite cartilage and its not quite a ligament/tendon.
It’s an ideal tissue to sandwich between adjacent vertebra in the vertebral column (an intervertebral disc) where it forms the outer wall of the disc (annulus fibrosus). Here it is responsible for resisting the compressive and tensile forces generated when our vertebra try to move apart and together as we flex our spines during everyday movement.