The lemon is a pale yellow oval citrus fruit with thick skin and fragrant, acidic juice which comes from small evergreen tree in the flowering plant family Rutaceae.

Lemon is a popular fruit, and people use a small amount of lemon to increase the flavor of food. However, due to their strong, sour taste, they are rarely eaten alone. Lemons add flavor to baked goods, seasonings, salad dressings, marinades, beverages, and desserts. They are also good sources of vitamin C.