Calcium is a crucial mineral in the diet due to its significant role in maintaining bone health and preventing conditions like osteoporosis. It is essential for the development and maintenance of strong bones and teeth, particularly during periods of growth. Additionally, calcium supports muscle function, nerve transmission, and hormonal secretion. Adequate intake throughout life is necessary to build a strong skeletal structure and reduce the risk of fractures. Dairy products, leafy greens, and fortified foods are primary sources of calcium, underscoring the importance of a balanced diet.