Bhagwan Vishnu !

He is the second member of the Hindu Trinity.
He is said to be the Preserver/Sustainer of life, especially because of His association with the principles of order, righteousness, and dharma (truth/nobility).Whenever these principles are threatened, and religion is endangered on the earth, He comes out of His transcendence to assume an earthly form, and incarnates on the earth to restore the principles, and save His devotees.
He takes on an earthly form and becomes incarnated. He is also known as Hari, the remover of sorrow, and Narayan.
He is described having a dark colour representing the passive and formless ether , a great quality for a pervading God.
There are a total of Ten incarnations (avatars) of Vishnu. These include
a fish (Matsya), tortoise (Kurma), man-lion (Narasimha), boar (Varaha), dwarf (Vaman), Parasu-Ram, Rama (of Ramayana), Krishna, Buddha and Kalki, who is yet to come. He has four hands :
First hand holds the conch shell (sankha) indicating spread of the divine sound "Om",
One hand holds a discus (chakra) which is a reminder of the wheel of time, and to lead a good life,
One holds a lotus (Padma) which is an example of glorious existence and
The fourth hand holds a mace (gada) indicating the power and punishing capacity of the Lord if discipline is broken.
Out of his navel blossoms a lotus which holds Brahma, the God of Creation whose responsibilities Vishnu has assumed.
His vehicle is Garuda , the swift flying bird - which can spread the Vedic knowledge with great courage. He is often depicted reclining on a coiled and many headed cobra (sheshnag) which rests on the cosmic waters. This represents the sleeping Universe.
Lord Vishnu's consort is Goddess Lakshmi, the Goddess of Wealth.
Lord Vishnu's most celebrated incarnations are Rama and Krishna. That is why, in India, Rama and Krishna are the most worshipped entities, people are not worshipping multiple Gods, but different forms and expansions of the same God.
"Om Namo Bhagavate Vasudevaya"
The mantra of Lord Vishnu. Any thing in the world is possible by worshipping lord Vishnu, who sustains the life in world. Enchanting this mantra saves a devotee from many troubles. It bestows the devotee with prosperity, peace, wealth etc.
Go to Vishnu Shlokam and Vishnu Shodasha Nama Shlokam (16 names) page.
Do not miss Dasavataram, The ten incarnations of Maha Vishnu.

Vishnu Shlokam
Shanta Karam Bhujaga Shayanam
Padmanabham Suresham
Vishvadharam Gagana Sadrsham
Megha Varnam Shubhangam
Lakshmi Kantam Kamala Nayanam
Yogibhir Dhyana Gamyam
Vande Vishnum Bhava Bhaya Haram
Sarva Lokaiaka Natham
I adore Vishnu, the embodiment of Peace, who sleeps on the serpent,
Whose naval is the lotus of the Universe
Who is the Lord of the Gods, who is the support of the Universe, Who is in the form of Space (the Omnipresent)
Whose color resembles that of clouds, Whose body is auspicious
Who is the Lord of Lakshmi, whose eyes are like lotuses
Who is attainable by Yogis through meditation
Who is the destroyer of the fear of birth and death
And who is the One Lord of all the Worlds
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Vishnu Shodasha Nama Shlokam (16 names)
This sloka reveals the 16 different names of Vishnu that one must chant when doing different activities in one’s life
Aushadhe Chintayét Vishnum Bhojané cha Janardanam
Shayane Padmanabham cha Vivahé cha Prajapatim
While taking medication remember Vishnu. Consuming food – Janardana
Sleeping remember – Padmanabha, during wedding – Prajapati
Yudhe Chakradharam Devam Pravase cha Trivikramam
Naraayanam Tanur-tyagé Sreedharam Priya-sangamé
At war – Chakradhari, Travel – Trivikrama
Death bed – Narayana, when meeting loved ones – Sreedhara
Du-swapne Smara Govindam Sankate Madhusoodanam
Kaanane Naarasimham cha Paavake Jalashaayinam
Bad dreams remember Govinda, in troubled times – Madhusoodana
In a forest remember Narasimha, In the midst of fire remember Jalashayina
Jalamadhye Varaham cha Parvate Raghunandanam
Gamane Vamanam chaiva Sarva-kaaryeshu Madhavam
In the middle of water (water activities or travel ) – Varaha, On a mountain (trekking) – Raghunandana (Rama). Travel by foot – Vamana, when you start any deed remember Madhava.
Shodashaitaani Naamani Pratarudhaya ya: padeth
Sarva-papa-vinirmukhto Vishnu-loke Maheeyate
One who reads these 16 names every morning will be rid of all sins and will attain Vishnu loka (Moksha).