Hi sima , sorry for the delay
this is your questions answer .
Diwali also called Divali, Deepavali or the "festival of lights", is a five-day Hindu festival which starts on Dhanteras, celebrated on the thirteenth lunar day of Krishna Paksha (waning moon fortnight) of the Hindu calendar month Ashvin and ends on Bhau-beej, celebrated on the second lunar day of Shukla Paksha (waxing moon fortnight) of the month Kartik. Dhanteras usually falls eighteen days after Dussehra. In the Gregorian calendar, Diwali falls between mid-October and mid-November.
Diwali is an official holiday in India,Nepal, Sri Lanka, Myanmar, Mauritius, Guyana, Trinidad and Tobago, Suriname, Malaysia, Singapore and Fiji.
For Hindus, Diwali is one of the most important festivals of the year and is celebrated in families by performing traditional activities together in their homes. ForJains, Diwali marks the attainment of moksha or nirvana by Mahavira in 527 BC, For Sikhs, Diwali is particularly important because it celebrates the release from prison of the sixth guru, Guru Hargobind, and 52 other princes with him, in 1619. Arya Samajists, celebrate this day as Death Anniversary of Swami Dayanand Saraswati. They also celebrate this day as Shardiya Nav-Shasyeshti.
The name "Diwali" or "Divali" is a contraction of deepavali which translates into "row of lamps". Diwali involves the lighting of small clay lamps filled with oil to signify the triumph of good over evil. These lamps are kept on during the night and one's house is cleaned, both done in order to make the goddess Lakshmifeel welcome. The festival starts with Dhanteras on which most Indian business communities begin their financial year. The second day of the festival is called the Naraka Chaturdasi. Amavasya, the third day of Diwali, marks the worship of Lakshmi, the goddess of wealth. The fourth day of Diwali is known as Kartika Shudda Padyami. The fifth day is referred to as Yama Dvitiya, and on this day sisters invite their brothers to their homes.