Special Relativity explains the relationship between space, time, mass, and energy. It shows that time and space are not separate entities but are connected as a single entity called spacetime. Additionally, it introduced the famous equation E=mc², which demonstrates that mass is engergy, energy is mass. They are equivalent and can be converted into each other. 

Albert Einstein’s Special Theory of Relativity, published in June 1905, revolutionized physics by introducing concepts like time dilation and length contraction, showing that the speed of light in a vacuum is constant and independent of the motion of all observers. It showed that as objects approach the speed of light, time slows down, lengths contract, and mass increases. This theory provided a new framework for all of physics by proposing that space and time are interwoven into a single continuum known as spacetime.