Swami Vivekananda, born Narendranath Dutta, was essentially a Hindu Brahmachari and monk, who was the pioneer to introduce the authentically Indian philosophies of Yoga and Vedanta to the rest of the world. 

He was responsible for reviving Hindu culture and renewing a spirit of nationalism in the Colonial India that had prevailed during his time. He also worked about to bring Hinduism to the fore and giving it the status of one of the major religions of the world, by the 19th Century. The most famed disciple of Saint Ramakrishna, Swami Vivekananda went on to become the founder of the Ramakrishna Math and the Ramakrishna Mission as well.

Viveknanda is probably best known for his inspiring speech on Hinduism at the Parliament of the World's Religions, held at Chicago in the year 1893, where he had astounded and impressed the audience by starting with the phrase, "Sisters and Brothers of America". 

While Vivekananda came to be regarded as India's spiritual ambassador in the United States, he is revered as a patriotic saint in modern India. To date, his birthday is celebrated as the National Youth Day.