Vitamin D is primarily obtained from sunlight and plays a crucial role in maintaining bone health. This vitamin aids in calcium absorption, which is necessary for bone density and strength. Insufficient levels of vitamin D can lead to conditions such as rickets in children and osteoporosis in adults, increasing the risk of fractures. Sources of vitamin D include direct sunlight exposure, fortified foods, and supplements. Maintaining optimal levels, particularly in regions with limited sunlight, is crucial for individuals to support skeletal health and overall physiological functions.