Theravada Buddhism, a major branch of Buddhism, claims to have preserved the original teachings of Siddhartha Gautama through the Pali Canon, which is considered the most complete early canon of Buddhist writings. Buddhism, which has existed for over 2,500 years, evolved without drastic schisms as disciples adapted to local contexts. The life of Siddhartha Gautama, including his birth and final teachings, forms the foundation of Buddhism's core tenets.