The most fundamental of Hindu deities, is the Trinity of Brahma, Vishnu and Shiva - popular deities include Ganesha, Krishna, Hanuman and goddesses like Lakshmi, Durga,Saraswati.
Lord Vishnu is considered as the preserver of the universe as per the Hindu Mythology. It is believed that Vishnu is an eternal and universal spirit associated with the primeval waters that pervaded before the creation of the universe. Vishnu Mantra forms the part of prayers offered to the lord. Sri Vishnu Mantra is as follows:
"Shaantaakaaram Bhujagashayanam Padmanaabham Suresham
Vishwaadhaaram Gaganasadrasham Meghavarnam Shubhaangam
Lakshmikaantam Kamalanayanam Yogibhirdhyaanagamyam
Vande Vishnum Bhavabhayaharam Sarvalokaikanaatham"
Meaning: Lord Vishnu is the preserver and protector of the Universe. He is always quiet and rests on the great serpent bed. The lotus of the creative power springs from the navel of Lord Vishnu. He is the Ultimate Power, who supports the entire universe. The divine Lord Vishnu is all-pervading as the sky and dark like the clouds. Vishnu, the lotus-eyed one, is the Lord of Lakshmi. The ascetics (yogis) observe Lord Vishnu through meditation. Lord Vishnu is the destroyer of the fear of Samsar. We surrender to such great lord.