Anil is a four-letter word that refers to an indigo-yielding shrub. It is a species of the genus Indigofera, which is native to tropical and subtropical regions of the world. The shrub is widely cultivated for its indigo dye, which is extracted from its leaves. ANIL has been used as a dye since ancient times and is still used today in many industries, including textiles, cosmetics, and food coloring.