The Equivalence Principle is a fundamental concept in physics, notably in the theory of general relativity developed by Albert Einstein. It states that in a small region of spacetime, the effects of gravity are indistinguishable from the effects of acceleration. There are two main formulations of the Equivalence Principle: Weak Equivalence Principle: This principle asserts that in a small region of spacetime, the trajectory of a freely falling test body is independent of its internal structure or composition. In other words, all objects fall in the same way in a gravitational field, regardless of their mass or composition. This idea was famously demonstrated by Galileo at the Leaning Tower of Pisa experiment. Strong Equivalence Principle: It extends the weak equivalence principle by including the equivalence of gravitational and inertial mass. Essentially, not only do objects fall the same way, but their gravitational mass (which determines their response to gravity) is also equivalent to their inertial mass (which determines their response to external forces).