Lord Vishnu, one of the Trinity Supreme, is the Lord of Preserver. He is of blue in color and having four arms with Conch, Discuss, Lotus and Mace on it. The name Vishnu comes from the root VISH, which means, "to spread in all directions, to pervade". He is the inner center, the core, the nucleus, and the cohesive point through which everything exists. He swells in everything, owns everything and overcomes any thing. The two most common representations of Vishnu show him either sleeping over the waves of the ocean on the coils of the serpent-deity, named Shesh Nag, or standing on waves with four hands each hand holding one of his four chief attributes. The worshippers of Lord Vishnu are called as "Vaishnavas".
• Matsya, The Fish, appeared in the Satya Yuga.
• Kurma, The Tortoise, appeared in the Satya Yuga.
• Varaha, The Boar, appeared in the Satya Yuga.
• Narasimha, The Man-Lion (Nara = man, simha = lion), appeared in the Satya Yuga.
• Vamana, The Dwarf, appeared in the Treta Yuga.
• Parashurama, the man with an axe, appeared in Treta Yug.
• Rama, Prince and king of Ayodhya and the Moral Man, appeared in the Treta Yuga.
• Krishna, The Cowherd and Philosophical Man, appeared in the Dwapara Yuga.
• Kalki, the Sage prince ("Eternity", or "time", or "The Destroyer of foulness"), who is expected to appear at the end of Kali Yuga, the time period in which we currently exist, which will end in the year 428899 CE.