The best source of calcium is typically the dairy food group, which includes milk, cheese, and yogurt. These foods provide significant amounts of calcium in forms that are easily absorbed by the body. For lactose intolerant individuals or those avoiding dairy, fortified alternatives such as plant-based milks (e.g., almond, soy) and specific leafy greens (like kale) can also serve as good sources of calcium, promoting strong bones and overall health.