Sai Baba of Shirdi, a reincarnation of Dattatreya, is probably the most popular Indian saint. He was a Sadguru which means a true guru. His teachings include love, forgiveness, helping others, charity, contentment, inner peace, devotion to God.
He worshiped by people from all religious and from all parts of the world.
This is a popular Aarti which means a prayer of the highest devotion dedicated towards Sai Baba.