The word Vishnu means 'one who pervades'. He pervades the whole universe. He is also known as Naarayana, Purushottama, Parandhama, Mukunda and Hari. Naarayana means 'one who has made the hearts of human beings His adobe'.
Many temples are dedicated to Lord Vishnu. Sri Ranganathaswamy Temple (Srirangam, Tamil Nadu) and Sri Padmanabhaswamy Temple (Trivandrum, Kerala) are very famous in south India. Srirangam is considered the first, foremost and the most important of the 108 main Vishnu temples (Divyadesams). This temple is also known as Bhooloka Vaikundam.
Lord Maha Vishnu's supreme abode is Vaikuntha. He rests on Ananta Shesha (great serpent). He is the consort Goddess Sri MahaLakshmi. He is the Lord of all worlds and the remover of all causes of fear. He is of blissful form.
Lord Sri MahaVishnu has four arms holding Shankha (conch), Chakara (discus), Gadha (mace) and Padma (lotus). The Shanka represents the five basic elements of the universe i.e., Earth, Water, Fire, Air and Sky. Chakra stands for cosmic mind. Mind is swift and sharp like chakra. Gadha indicates the cosmic intellect and Padma indicates the evolving world.
People of south India worship SriDevi and BhooDevi as consorts of Lord Maha Vishnu. Goddess Sridevi is the spiritual energy of God and Goddess Bhoodevi is the mother of this Universe. Sridevi and Bhoodevi are the two manifestations of Goddess Sri Maha Lakshmi.