Calcium (Ca²⁺) is a chemical element and an essential mineral found in many foods. It plays a crucial role in various bodily functions, including building and maintaining strong bones and teeth. Calcium is also important for muscle contraction, nerve signaling, and blood clotting. In the human body, calcium is primarily stored in the bones, where it provides structural support. Dietary sources of calcium include dairy products, leafy green vegetables, and fortified foods. Adequate calcium intake is vital for overall health, particularly during periods of growth and development, such as childhood and adolescence.