Sankha Madhava form of Lord Vishnu is associated with Maya or illusion that keeps a human being perpetually in the cycle of birth and death. Sankha Madhava is the king of Maya and his worship helps a devotee in attaining moksha or liberation. As per Hindu belief, the aim of all living beings is to escape from the cycle of birth and death.
Sankha Madhava Mantra
Om Shankha Choodaya Madhavaya Hari Namah
It is believed that at the time of dissolution of the universe, Shankh Madhava encircles the entire area of the confluence of Ganga, Saraswati and Yamuna with waters of a conch shell.
It is said that when Sankha Madhava blows on his conch, the devotees become free from maya (the power of delusion).