Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Herniated Disk ?
    ### Response:
    Your backbone, or spine, is made up of 26 bones called vertebrae. In between them are soft disks filled with a jelly-like substance. These disks cushion the vertebrae and keep them in place. As you age, the disks break down or degenerate. As they do, they lose their cushioning ability.
    