Holi is a spring festival in India also known as the festival of colours or the festival of sharing love.
The Holi festival is a celebration of the triumph of good over evil. The demon king Hiranyakashipu had decreed that no one would worship any God but himself. But his son Pralhad worshiped only lord Vishnu.
To punish him he asked his sister Holika (from whose name word Holi is derived) to enter the fire carrying Pralhad. He thought Pralhad will perish in fire but nothing would happen being a Rakshasi (demon). But Pralhad survived and Holika perished.
Holi is celebrated as a 2-day festival that starts on Pournima (full moon) in the Hindu month of Falgun. The first day is known as Holika Dahan (incineration of Holika) and second day is known as Rangwali Holi or Dhulivandan.
On the night of first day Bonfires are lit, in an attempt to recreate the scene of incineration of Holika (Holika Dahan).
The following day known as Dhuli in Sanskrit. Children & youth enjoy it by throwing Gulal & Abir (coloured powders) on each other.