The equation, E = mc², from Albert Einstein's paper on special relativity, states that energy is equal to mass multiplied by a squared constant representing the speed of light. This means that there is a tremendous amount of energy in a small amount of matter.
The famous equation is a popularized version of the one from Einstein's special relativity paper, where it was expressed as M = e/c², explains PBS. This equation operates on the theory that everything, including matter, is essentially some kind of energy. The special relativity theory uses the idea of the speed of light as a constant to explain other facets of reality. The theory helped prove that as objects move faster they change in size and age slower in relation to objects that are standing still.
The idea that matter and energy are the same led to new ways of thinking. The idea that humans can convert matter to energy was the central idea that led to the creation of nuclear power and atomic bombs. This idea also laid the foundation for much of modern science's understanding of the universe, such as how stars are formed and the idea that the universe originated from a cataclysmic explosion called the Big Bang. Some scientists consider E = mc² to be the most important equation ever created.