Vitamins A, D, E, and K are essential nutrients that play vital roles in maintaining health. Vitamin A supports vision, immune function, and skin health, while Vitamin D helps regulate calcium and phosphorus, promoting strong bones. Vitamin E acts as an antioxidant, protecting cells from damage, and Vitamin K is crucial for blood clotting and bone metabolism. These vitamins can be obtained from various foods, including leafy greens, nuts, dairy products, and fish, ensuring a balanced diet for overall well-being.