As Hindu people celebrate Diwali, it ignites interest of its importance for Indian people. Diwali, also known as Deepavali and the Hindu “Festival of Lights,” is one of India's most widely celebrated holidays. It overlaps with other harvest rituals and festivals. The dates for the holiday vary each year as they follow the lunar calendar. Diwali originated in India more than 2,500 years ago. The annual festival, which expands to the Indian diaspora, is usually observed for five days or even as short as one day, depending on where a person lives or how the person celebrates.