Key Lime, also known as the Mexican Key Lime or West Indian Lime, is a small, tangy citrus fruit celebrated for its distinctively sharp and aromatic flavor. It is the star ingredient in the famous Key Lime pie and is frequently used in beverages, marinades, and desserts. The fruit is small, typically 1-2 inches in diameter, and has a thin, smooth skin that turns from green to yellow when ripe. Its juice is more acidic and aromatic compared to the Persian lime, making it a favorite for culinary uses.

The Key Lime tree is an evergreen, bushy tree with thorny branches and dark green, glossy leaves. It is a fast-growing tree that produces fragrant white flowers, which eventually develop into the small, juicy fruits. This lime tree thrives in tropical and subtropical climates and can be grown in containers or gardens. The tree is known for its high yield, often producing fruit throughout the year in warm climates.