general covariance

General covariance is a principle in Einstein's theory of General Relativity stating that the laws of physics are the same regardless of the coordinate system used to describe them. In simpler terms, whether you describe events using one set of coordinates or another (like shifting or rotating your grid), the fundamental physics remains unchanged. This ensures the laws are universal and not dependent on any specific perspective, emphasizing that the fabric of spacetime and gravity are inherent properties of the universe, not tied to how we observe or measure them.