Grapefruit is a type of citrus fruit that belongs to the genus Citrus and the species paradisi. It has a yellow or red outer skin with white flesh, and it's known for its juicy texture and slightly bitter taste. The grapefruit got its name due to its large size and resemblance to grapes when it was first discovered in Barbados in the 18th century. Today, grapefruits are grown in many parts of the world including Florida, Texas, and Israel, and they're enjoyed as a healthy snack or used in recipes for desserts, salads, and drinks.