A grapefruit is a subtropical citrus fruit that is a hybrid of the pomelo and the sweet orange. It is round or oblong in shape, with a yellow or pinkish-red skin and a juicy, acidic flesh. Grapefruits are known for their tart and bitter flavor, which can vary depending on the variety. They are often eaten for breakfast, juiced, or used in salads and other dishes. Grapefruits are a good source of vitamin C, fiber, and antioxidants, and may have health benefits such as improved digestion, weight loss, and lower risk of certain diseases.