A Deepak is an oil lamp, usually made from clay, with a cotton wick dipped in ghee or vegetable oils. Clay Diyas are often used temporarily as lighting for special occasions, while Diyas / Deepak made of Brass are permanent fixtures in home and temples. Diyas / Oil Lamps are native to India, and are often used in Hindu, Sikh, Jain and Zoroastrian religious festivals such as Diwali.