Vitamins and minerals are nutrients that are essential for health. Vitamins are classified as either fat-soluble or water-soluble and help processes like healing wounds, forming blood cells, and maintaining the nervous system. Minerals are chemical elements like calcium, iron, and potassium that are needed for enzyme activity and bone formation. Water is also important, with adults needing around 8 glasses per day, as it transports nutrients, regulates body temperature, and more. Dehydration can be dangerous and cause issues like fatigue or headaches.