Bone is a hard, dense tissue that makes up the skeleton of humans and many animals. It provides structure, support, and protection for vital organs. Bones also play a crucial role in movement by serving as attachment points for muscles. They are made up of a mix of minerals, mainly calcium and phosphorus, which give them strength and rigidity. In addition to their structural role, bones are important for producing blood cells. Inside certain bones, like the femur and sternum, there is a soft tissue called bone marrow that creates red and white blood cells. This makes bones essential not just for movement, but also for overall health.