The Bhakti movement originated in ancient Tamil Nadu. The Nayanmars and the Alvars played a major role in the Bhakti movement. It began to spread to the north during the late medieval ages when north India was under Islamic rule. The Hindus were converting in large numbers, especially the lower castes. The reason for this was that Hinduism had no solution for the centuries old caste system which had become stagnant and exploitative over the time.[1] The Bhakti movement was counter to the prevalent caste ideology which was dividing Hindus. So, the Bhakti movement has its own importance in saving Hinduism. There was no grouping of the mystics into Shaiva and Vaishnava devotees as in the south. The movement was spontaneous and the mystics had their own versions of devotional expression.
Unlike in the south, where devotion was centered on both Shiva and Vishnu (in all his forms), the northern devotional movement was centered on Rama and Krishna, both of whom are believed to be incarnations of Vishnu. Despite this, the sects of Shiva or of Vishnu did not go into decline. In fact for all of its history the Bhakti movement co-existed peacefully with the other movements in Hinduism. It was initially considered unorthodox, as it rebelled against caste distinctions and disregarded Brahmanic rituals, which according to Bhakti saints were not necessary for salvation. In the course of time, however, owing to its immense popularity among the masses (and even gaining royal patronage) it became 'orthodox' and continues to be one of the most important modes of religious expression in modern India. IMPACT OF BHAKTI MOVEMENT
Bhakti movement helped in decreasing the bitterness among the muslims and hindus.It helped in the rise of vernacular literature.For example Punjabi in the north and Bengali in the south.It helped the common men to fight against the rigidity of the caste system.The Bhakti Movement