Annadhanam in Tiruvannamalai is a significant charitable activity that is closely associated with the holy temple town and the worship of Lord Arunachaleswarar. Annadhanam refers to the offering of food, typically to the poor and needy, as a form of selfless service and spiritual merit (or punya). It is considered an essential act of charity in Hinduism and is often performed in sacred places like Tiruvannamalai, especially in connection with spiritual practices and festivals.