Holi, also called the Festival of Colours, is a popular Hindu spring festival observed in India, Nepal, and countries with large Hindu diaspora such as Suriname, Guyana, South Africa, Trinidad, the UK, Mauritius and Fiji. In West Bengal of India and Bangladesh, it is known as Dolyatra (Doljatra) or Boshonto Utsav ("spring festival").
The main day, Holi, also known as Dhulheti, Dhulandi or Dhulendi, is celebrated by people throwing coloured powder and coloured water at each other. Bonfires are lit the day before, also known as Holika Dahan (death of Holika) or Chhoti Holi (little Holi). The bonfires are lit in memory of the miraculous escape that young Prahlad had when Demoness Holika, sister of Hiranyakashipu, carried him into the fire. Holika was burnt but Prahlad, a staunch devotee of Lord Vishnu, escaped without any injuries due to his unshakable devotion. Holika Dahan is referred to as Kama Dahanam in Andhra Pradesh.
Holi is celebrated on the full moon day in the month of Phalugna or Falguna (Phalgun Purnima), which usually falls in the later part of February or March. In 2009, Holi (Dhulandi) was on 11th March and Holika Dahan was on 10th March.