Buddhism is a philosophy and religion based on the teachings of Buddha, who lived in ancient India in the 6th century BCE. Some key concepts in Buddhism include impermanence, karma, and the four noble truths that identify suffering and its causes. Buddhism's ultimate goal is to end suffering by eliminating craving and attachment through enlightenment and following the eightfold path. Buddha taught that nothing in life is permanent, everything is constantly changing, and that desire and ignorance are the primary causes of suffering.