Calcium is critical for maintaining bone health and density. It plays a fundamental role in developing and maintaining strong bones and is essential for various physiological functions, including muscle contractions and nerve signaling. Adequate calcium intake helps prevent conditions such as osteoporosis, characterized by weak and brittle bones. Individuals, especially those engaged in physical activity, must ensure sufficient calcium levels through diet or supplementation. Dairy products, leafy greens, and fortified foods are excellent sources of calcium, helping support overall bone health throughout life.