Lord Vishnu is one of the most significant Gods in Hindu religion. Along with Lord Shiva and Lord Brahma, He is the part of the Trimurti concept of Hinduism. Lord Vishnu is the preserver and the protector of the universe while Lord Shiva and Lord Brahma are the destructor and the creator of the universe respectively.
Lord Vishnu is the supreme god of the Vaishnava Sampradaya.
The wife of Lord Vishnu is Goddess Lakshmi, the goddess of wealth and prosperity. It is believed that the Goddess Lakshmi resides in the heart of Lord Vishnu and devotees who worship Lord Vishnu are also blessed with the wealth and prosperity.
As per South Indian traditions, Shridevi and Bhoomadevi are the two consorts of Lord Vishnu. Hence, in few images, Lord Vishnu is flanked by two consorts.
Lord Vishnu resides in Kshir Sagar, the milky ocean. Lord Vishnu rests on the couch made of the serpent Sheshnag. The lotus, the beloved flower of Goddess Lakshmi, originates from the navel of Lord Vishnu and Lord Brahma mounts on the same flower.
Lord Vishnu and Goddess Lakshmi have 18 sons, named Devasakha, Chiklita, Ananda, Kardama, Shriprada, Jataveda, Anuraga, Samvada, Vijaya, Vallabha, Mada, Harsha, Bala, Teja, Damaka, Salila, Guggula, Kuruntaka.
One of His most important Mool Mantra-
ॐ नमोः नारायणाय। ॐ नमोः भगवते वासुदेवाय॥
Om Namoh Narayanaya। Om Namoh Bhagavate Vasudevaya॥
There are 10 popular incarnations of Lord Vishnu which are popularly known as Dashavatara.
Dashavatara is the most popular list of incarnations of Lord Vishnu. However another list which gives 24 incarnations of Lord Vishnu is also popular among devotees of Lord Vishnu.