Krishna (literally "black, dark blue") is a Hindu deity, a "complete" avatar (or "incarnation") of the preserver-god, Vishnu.
Krishna is often described and portrayed as an infant or young boy playing a flute as in the Bhagavata Purana, or as a youthful prince giving direction and guidance as in the Bhagavad Gita. The stories of Krishna appear across a broad spectrum of Hindu philosophical and theological traditions. They portray him in various perspectives: a god-child, a prankster, a model lover, a divine hero and the Supreme Being. The principal scriptures discussing Krishna's story are the Mahabharata, the Harivamsa, the Bhagavata Purana and the Vishnu Purana.
Worship of a deity of Krishna, either in the form of Vasudeva, Bala Krishna or Gopala, can be traced to as early as 4th century BC. Worship of Krishna as svayam bhagavan, or the Supreme Being, known as Krishnaism, arose in the Middle Ages in the context of the bhakti movement. From the 10th century AD, Krishna became a favourite subject in performing arts and regional traditions of devotion developed for forms of Krishna such as Jagannatha in Orissa, Vithoba in Maharashtra and Shrinathji in Rajasthan. Since the 1960s the worship of Krishna has also spread in the West, largely due to the International Society for Krishna Consciousness.