Key lime is a small, round citrus fruit known for its tart flavor and bright yellow-green color. It is primarily grown in the Florida Keys, which is how it got its name. The fruit is smaller than the more common Persian lime and has a thinner skin. Key limes are often used in desserts, particularly in the famous Key lime pie, which combines the juice with sweetened condensed milk and egg yolks. The Key lime tree is a tropical plant that thrives in warm climates. These trees are typically smaller than other lime trees and can produce fruit year-round. Key limes are rich in vitamin C and are often used in beverages, marinades, and dressings, adding a zesty flavor to various dishes.