Vaishnavism is a tradition of hinduism.these people are distingushed by worship of Lord "VISHNU".The follower of vaishnavism are called as vaishnavas.The people worship the god in the name of Narayana,Rama,Krishna.it beliefs and practice as "BAKTHI YOGA".
Vaishnavas are further classified into Bhramins and Non Bhramins.Among Bhramins main groups are
1.Iyengars
2.Madhvas
Iyengars who follows the principals of Sri Ramanujar.Iyengars are classified into Vadakalai and Thengalai.
