Lord Vishnu

             
Vishnu also known as Narayana, is supreme being or Ultimate Reality for Vaishnavas and a manifestation of Brahman in the Advaita or Smarta traditions of Hinduism.The Vishnu Sahasranama describes Vishnu as the All-Pervading essence of all beings, the master of and beyond the past, present and future, the creator and destroyer of all existences, one who supports, sustains and governs the Universe and originates and develops all elements within.
In the Puranas, Vishnu is described as being the color of clouds (dark-blue), four-armed, holding a lotus, mace, conch and chakra (wheel). Vishnu is also described in the Bhagavad Gita as having a 'Universal Form' (Vishvarupa) which is beyond the ordinary limits of human sense perception. It is also within the Puranas that the information regarding Vishnu's avatars is given. Nine of these avatars, or 'incarnations' are described as having occurred in the past, with one still to happen at the end of Kali Yuga. The Bhagavad Gita mentions their purpose as being to rejuvenate Dharma and vanquish negative forces.
In virtually all the Sanatana Dharma traditions, Vishnu is worshipped, either directly or through avatars such as Rama, Krishna, Varaha and Narasimha. It should be however noted that although its is usual to speak of Vishnu as the source of the avataras, this is only one of the names of god in Vaishnavism who is also known as Narayana, Vasudeva and Krishna and behind each of those names is a divine figure with attributed supremacy in Vaishnavism.
Whenever the Adharma goes unbearable Lord Mahavishnu takes Avatars and relieves people from Adharma and establishes the rule of Dharma. Such glorious Lord MahaVishnu has chosen 108 sacred places in our country of India to accomodate His Divine Abode. In Tamil language these places are called "TIRUPATHIGAL" and in Vainavite these are called "DIVYA DESAMS".