For long and happy married life. For peace and happiness and to get rid of evil forces. Lord Vishnu represents the aspect of the Supreme Reality is the Lord of protection & maintenance. His consort Lakshmi is the possessor of wealth, which is a necessity for maintenance. Goddess Lakshmi represents not only material wealth, but the wealth of grains, courage, valour, offsprings, success, luxurious life, eternal bliss.

Vishnu symbolizes the all-pervading protective aspect of the Supreme God, Brahman. However, according to Hindu mythology, Vishnu is reincarnated on earth from time to time, to destroy the evil in the world.The four arms indicate Lord's omnipresence and omnipotence. The right side of the body represents the creative activities of the mind and the intellect. The left side symbolizes the activities of the heart; that is, love, kindness, and compassion.

The following ten incarnations of Lord Vishnu are described in Hindu mythology and are popular among Hindus. These incarnations reveal the help rendered by God during various stages of human evolution.

Matsya (fish)---saves Sage Manu from floods and recovers the Vedas from demons.
Kurma (tortoise)---sustains the earth on his back.
Varaha (boar)---brings the earth back from the bottom of the ocean where it was dragged down by a demon, known as Hiranyaksha; Varaha kills the demon.
Narasimha (man-lion)---kills the demon King Hiranyakashipu, who was planning to kill his own son, a devotee of Lord Vishnu.
Vamana (dwarf)---the first human incarnation of the Lord, kills the demon King Mahabhali, who had deprived the gods of their possessions.
Parasurama (the warrior with an axe)---saves Brahmins from the tyranny of the arrogant Kshatriyas.
Rama---kills Ravana, the demon king of Lanka.
Sri Krishna---the most popular incarnation; Krishna's contributions throughout his life include the teachings of the Bhagavad Gita to Arjuna.
Buddha---Hindus consider Buddha as an incarnation of Lord Vishnu and accept his teachings, but do not directly worship him.
Kalkin (a man on a white horse)---this incarnation is yet to come and will mark the end of all evil in the world.

Lord Vishnu is also called Nilameghashyamalan - possessing a complexion the colour of the dark clouds. As proof that opposites attract, Vishnu's outer appearnce is dark while he is associated with the santha gunam, bringing light & peace to the world. He rests on the ocean on his bed of Adisesha (serpent with 1,000 heads ). Any time Lord Vishnu sees great trouble, He takes an avataram to rescue the people from evils. He is all merciful, ever rushing to serve his devotees. In the form of Mahavishnu he has four arms wielding the chakra, conch, lotus & the gadha in his four arms.