Explanation:

Prarthana Samaj or the "Prayer Society" in Sanskrit, was a movement for the religious and social reform in Bombay, India, build on the earlier reform movements. Prarthana Samaj was established by the Dadoba Pandurang and with his brother Atmaram Pandurang in the year 1867 when Keshub Chandra Sen got visited Maharashtra, with a goal to make people believe in one God and worship in only one God. It than became popular when Mahadev Govind Ranade joined. The important reformers were the intellectuals who advocated the reforms of the social system of the Hindus. It was spread to southern India by famous Telugu reformer and writer, Kandukuri Veeresalingam. Religious reforms By comparing with the parallel Brahmo Samaj of Bengal, and the concept of rational or the theistic belief and the social reform, the Prarthana Samaj(ists) were the followers of the great religious tradition of the Marathi Sant Mat such as Namdev, Tukaram. The Brahmo Samaj founders examined various world religions, constitutes ancient Vedic texts, which subsequently were not adopted to be the infallible or divine. Although the adherents of Prarthana Samaj were the devoted theists, they also didn't regard the Vedas as divine/infallible. They drew their nourishment from that of the Hindu scriptures and also used the hymns of the old Marathi "poet-saints" in their prayers. Their principle trace back to the devotional poems of the Vitthalas as part of the Vaishnava bhakti devotional movements of the 13th century in southern Maharashtra. 

Social reforms Prarthana Samaj critically surveyed the relations between the contemporary social and cultural systems and religious beliefs and gave the priority to the social reform as compared with that of the political changes already introduced by the British government. Their comprehensive reform movement has led several impressive projects of cultural change and social reform in Western India, like the improvement of a lot of women and depressed classes, an end to the caste system, the abolition of child marriages and infanticide, educational opportunities for women, and remarriage of widows.