As per hindu mythology Lord Vishnu Ji is considered as maintainer of this world or Lok. Vishnu Pujan is done on various occasions as guided by the pandit Ji. Vishnu Sahashtra nam Puja is also done on or after untimely death of a person to avoid reaching him/her in
Pretyoni.
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.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 (serp
with 1,000 heads ). Any time Lord Vishnu sees great trouble, He
takes an avatar to rescue the people from evils. He is all
merciful, ever rushing to serve his devotees
