please tell me about hindu god Vishnu story?

ANSWER TO THE ABOVE QUESTION Vishnu is one of the main Hindu deities. Vishnu is worshipped as the protector and preserver of the world. He is known mainly through his incarnations, especially Rama, Krishna and Buddha. In the Bhagavad Gita, Vishnu is described as having a 'Universal Form which is beyond the ordinary limits of human imagination. Vishnu manifests himself anytime he is needed to fight the evil, and his appearances are innumerable; but his ten incarnations are most commonly recognized. Vishnu often stands in sculpture as a princely male with four arms that bear a club, discus, conch, and lotus flower. He may also appear lying on his back on the thousand-headed king of the serpents, Shesha-Naga, in the milk ocean at the center of time, with his feet massaged by Lakshmi, and with a lotus growing from his navel giving birth to the god Brahma, a four-headed representation of the creative principle. Vishnu is the ultimate source of the universe that he causes to expand and contract at regular cosmic intervals measuring millions of years. Vishnu may become incarnate at any moment on earth in order to continue to bring sentient creatures back to himself, and a number of great religious teachers are identified by their followers as incarnations of Vishnu.