IN Hinduism, Vishnu is the second figure in the Trimurti-the trio of principal deities. His major task is to preserve the universe, steady and safe, along with ensuring life continues and dharma (righteousness) prevails. You will frequently see him depicted as stepping down into the world in various avatars, like Rama and Krishna, especially at times when chaos stirs things up. He comes to restore the balance between good and evil.
The Destroyer: Shiva, or Mahesh, is known by this name since he dissolves the universe at the end of a cosmic cycle.
The Creator: That title is Brahma's, he who initiates the universe and all living beings.