The Equivalence Principle is a fundamental concept in physics that states the effects of gravity are indistinguishable from acceleration. This means that if you are in a closed room, you cannot tell whether the force you feel is due to gravity or because the room is accelerating through space. This principle is a key idea in the theory of Albert Einstein's General Relativity. In practical terms, the Equivalence Principle implies that the laws of physics operate the same way in a gravitational field as they do in an accelerating frame of reference. This insight led to a deeper understanding of how gravity affects time and space, ultimately reshaping our comprehension of the universe.