The physicist known for the theory of relativity is Albert Einstein. His groundbreaking work fundamentally changed the understanding of space, time, and gravity. The theory, articulated in two parts—special relativity and general relativity—offered a new framework for physics, challenging Newtonian views. Einstein's equation, E=mc², established the equivalence of mass and energy, influencing various scientific fields. His contributions extended beyond theory; they laid the groundwork for advancements in quantum mechanics, cosmology, and modern physics. Einstein's insights continue to shape scientific inquiry and understanding of the universe.