The Pythagorean Theorem, discovered thousands of years ago, continues to make its mark around the world. The theorem has been named the "most proved theorem" as hundreds of proofs have been constructed by various mathematicians (Overduin). There are uses for the theorem in numerous jobs and professions and it is a significant part of our society. This website will explain what the Pythagorean theorem is, outline its ancient to modern history, provide various proofs which have been developed, and give examples of how it is used in mathematics as well as applications in the real world.