Bone is a complex living tissue made up of several components. The main component of bone is a mineral called hydroxyapatite, which gives bone its hardness and strength. Hydroxyapatite is a crystalline form of calcium phosphate that is deposited in a matrix of collagen fibers. The collagen fibers provide flexibility and resilience to bone, allowing it to withstand stress and strain. Bone also contains living cells, including osteoblasts, osteocytes, and osteoclasts, which are responsible for maintaining and remodeling bone tissue throughout life. Additionally, bone contains blood vessels, nerves, and other connective tissues that support its function and growth.