This day is a thrice blessed day. Lord Buddha is considered the ninth avatar (incarnation) of Vishnu (Preserver in the Hindu Holy Trinity of Creator-Preserver-Destroyer). Gautam Buddha "lived and died in about the fifth century before the Christian era". Buddha means "enlightened one" - someone who is completely free from all faults and mental obstructions.
Gautam Buddha was not a god and the philosophy of Buddhism does not entail any theistic world-view. The teachings of the Buddha are solely to liberate human beings from the misery and sufferings of life.
According to the Buddhism, sorrow and desire are the main cause of all the evil and suffering of this world. Lord Buddha advocated the Eightfold Path consisting of precepts like right conduct, right motive, right speech, right effort, right resolve, right livelihood, right attention and right meditation to gain mastery over suffering. It is only after following this path one can reach the ultimate aim of Nirvana. Nirvana is the transcendental state of complete liberation. Gautama Buddha lived and taught in northern India in the 6th Century B.C.