Kaffir lime leaves are the aromatic leaves of the Citrus hystrix tree, commonly used in Southeast Asian cuisine. They are known for their unique, citrusy flavor and are often added to dishes like curries, soups, and stir-fries. The leaves are dark green, glossy, and have a distinctive double leaf structure, making them easy to identify. In addition to their culinary uses, kaffir lime leaves are also valued for their essential oils and medicinal properties. They are believed to have antibacterial and anti-inflammatory effects, and are sometimes used in traditional remedies. Their fragrant aroma also makes them popular in aromatherapy and natural perfumes.