The curry tree (Murraya koenigii) is a tropical to sub-tropical tree in the family Rutaceae (the rue family, which includes rue, citrus, and satinwood), which is native to India and Sri Lanka.
Its leaves are used in many dishes in India, Sri Lanka, and neighbouring countries. Often used in curries, the leaves are generally called by the name 'curry leaves', although they are also literally 'sweet neem leaves' in most Indian languages (as opposed to ordinary neem leaves which are very bitter and in the family Meliaceae, not Rutaceae.
Curry leaves are used in traditional medicinal practices as well as in cooking. They are considered antimicrobial, anti-inflammatory, and even anti-diabetic. They are used to keep the skin and hair healthy, along with the digestive system.