Vitamins are essential organic compounds that play critical roles in the body's health and functioning. These nutrients are required in small amounts for growth, reproduction, and maintaining good health. Unlike macronutrients like carbohydrates, proteins, and fats, which provide energy, vitamins are involved in various biochemical processes. They support the immune system, aid in the production of energy, help in blood clotting and bone health, among other functions. Since the body cannot synthesize sufficient amounts of most vitamins, they must be obtained from the diet, supplements, or, in the case of vitamin D, sunlight exposure.