Diyas are small clay lamps that are filled with oil and lit with a wick to create a warm inviting atmosphere. The use of clay diyas for Diwali celebrations has been around since ancient times when they were made in the form of small bowls and filled with ghee (clarified butter). Today however they are often made in the form of small pots and filled with vegetable oil. The design of the diyas can vary with some having intricate designs carved into them while others may be simpler and more basic in design. No matter the design the use of terracotta clay diyas for Diwali decoration is a tradition that has been embraced by many generations.