Gautama Buddha, also known as Siddhartha Gautama, is the founder of Buddhism and a key figure in the religion's teachings about suffering, enlightenment, and liberation. His life story details the journey from a privileged prince to an enlightened being who attained Nirvana, providing a pathway for others to break the cycle of samsara and achieve liberation through his insights on the Four Noble Truths and the Eightfold Path.