“Relativity: The Special and the General Theory” by Albert Einstein is a groundbreaking work that revolutionized our understanding of space, time, and gravity. Originally published in 1915, this seminal scientific treatise outlines Einstein’s theories of relativity, introducing the world to concepts that would reshape the foundations of physics. In the special theory of relativity, Einstein proposes that time and space are intertwined, and that the laws of physics are the same for all observers moving at constant speeds. The general theory of relativity, on the other hand, provides a new understanding of gravity, positing that massive objects like planets and stars cause a curvature in space-time. Einstein’s eloquent explanations make these complex concepts accessible to a broader audience, and his equations have since become fundamental to our comprehension of the cosmos.