Multivitamins are dietary supplements that contain a combination of vitamins and minerals. They are designed to fill nutritional gaps in a person's diet, providing essential nutrients that may be lacking from food sources. Common ingredients include vitamins A, C, D, E, and various B vitamins, along with minerals like calcium, iron, and zinc. Many people take multivitamins to support overall health, boost energy levels, or enhance their immune system. While they can be beneficial, it's important to remember that they should not replace a balanced diet rich in fruits, vegetables, and whole grains. Always consult a healthcare professional before starting any supplement regimen.