An onion is a round vegetable with a strong flavor and a papery skin. It comes in various colors, including white, yellow, and red. Onions are commonly used in cooking to add depth and richness to dishes, making them a staple in many cuisines around the world. They can be eaten raw in salads or cooked in soups, stews, and stir-fries. When you cut an onion, it often causes tears due to the release of a gas that irritates the eyes. To reduce this effect, some people chill the onion before cutting or use a sharp knife. Onions are also known for their health benefits, as they contain vitamins and antioxidants that can support overall well-being.