Hindu festival Diwali - Kali Puja

Aarti (Hindi आरती), also spelled arathi, aarthi (from the Sanskrit term Aradhana) is a Hindu ritual, in which light from wicks soaked in ghee (purified butter) or camphor is offered to one or more deities. The aarti plate is generally made of metal, usually silver, bronze or copper. On it must repose a lamp made of kneaded flour, mud or metal, filled with oil or ghee. One or more cotton wicks (always an odd number) are put into the oil and then lighted, or camphor is burnt instead. The plate may also contain flowers, incense and akshata.[1] In some temples, a plate is not used and the priest holds the ghee lamp in his hand when offering it to the Deities.
The purpose of performing arati is the waving of lighted wicks before the deities in a spirit of humility and gratitude, wherein faithful followers become immersed in God's divine form. It symbolises the five elements: 1) space (akash), 2) wind (vayu), 3) light (tej), 4) water (jal), and 5) earth (pruthvi). Communal Aarti is performed in the mandir; however, devotees also perform it in their homes.