Rangpur lime, also known as the mandarin lime, is a citrus fruit that is tart and acidic with a distinctively bright flavor. Its popularity has led to the creation of many synonyms, including the Rangpur orange, citron lime, and surkh nimbu. It is often used in cooking and cocktails, and its juice can be used as a marinade or to add a zingy flavor to drinks. The fruit is also used in traditional medicine for its high vitamin C content, which is said to boost the immune system and ward off illness. With its tangy, flavorful profile, the Rangpur lime has become a staple ingredient in many cuisines around the world.