Specifically, there are two theories of relativity attributed to Einstein:
* Special Relativity (published in 1905) deals with the relationship between space and time. It postulates that the laws of physics are the same for all observers in uniform motion and that the speed of light in a vacuum is the same for all inertial observers, regardless of the motion of the light source.
* General Relativity (published in 1915) extends special relativity to include gravity. It describes gravity not as a force, but as a curvature of spacetime caused by the presence of mass and energy.
Einstein's theories of relativity revolutionized our understanding of the universe and challenged Newton's classical physics, which had been the accepted framework for centuries. They replaced the idea of absolute space and time with a more complex and interconnected view of the universe.
