Onions are round, layered vegetables with a strong, savory flavor. They come in different colors, including white, yellow, and red. Onions are commonly used in cooking to add flavor to dishes like soups, salads, and stir-fries. They can be eaten raw, cooked, or fried. Onions are rich in vitamins, minerals, and antioxidants, offering health benefits such as supporting heart health and improving digestion.