Lime is a term that actually refers to a number of different fruits which are all typically looking like small green(ish) lemons. They are often used to accent the flavours of foods and beverages and they are a very common ingredient in a wide varitey of Caribbean dishes and drinks.
In cooking we use both the juice and the zest for the acidity or for the floral aroma, and lime is a common ingredient in both hot and cold food. In the Caribbean kitchen, limes are one of the most important ingredients in sauces and marinades. It is also an ingredient that can change a taste from savoury to sweet!
By the way – did you know that lime is the reason the English are called Limeys? During the 19th Century, the British sailors got a daily ration of citrus fruits to prevent scurvy.