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, where it thrives in the warm, humid climate. The fruit is often used in desserts, particularly in the popular Key Lime Pie, which combines its juice with sweetened condensed milk and egg yolks. The key lime tree, scientifically known as Citrus aurantiifolia, is a tropical plant that produces these distinctive limes. Unlike regular limes, key limes are smaller and have a thinner skin. They are rich in vitamin C and are often used in beverages, marinades, and dressings, adding a refreshing zest to various dishes.