Karthigai Deepam is a Hindu festival celebrated in Tamil Nadu to honor the birth of Lord Muruga and mark the victory of light over darkness. It is celebrated with families and friends coming together and enjoying traditional South Indian sweets. Some popular sweets made during this festival include payasam, which is a sweet rice pudding made with milk, rice, and sugar; vada, which are lentil doughnuts or patties that are deep fried; and appam, which are coconut pancakes.