Holi marks the burning of the demoness Holika, who tried to destroy the boy-devotee Prahlada at her brother Hiranyakashipu's command. Vishnu's protection of Prahlada — and the consequent burning of Holika in the very fire she had built — is the festival's foundational story.
The day after Holika Dahan, Rangwali Holi, commemorates Lord Krishna's playful smearing of colours on Radha and the gopis in Vrindavan. This expression of bhakti through colour, music and dance has become the most universally Hindu celebration of love and friendship.
Holi falls on Phalguna Purnima — the full-moon night that closes the lunar year.
