of tannin and is converted to gallic acid and glucose. Natural tannins occur in various parts of plants such as leaves, roots, bark and fruits. Tannins are distributed in animals, insects and microorganisms. However, microbial tannase is one of the great attention in many industries. Gallic acid is one of the industrial and therapeutic molecules that is widely used in various applications. Tannase is also applicable in feed, pharmaceutical, brewing, chemical and beverage industries. Furthermore, tannase plays a significantly important role in biodegradation or reduction of tannin from the tannery effluent. The present review apprises a brief description of tannase and its industrial applications.