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General Relativity is a theory that describes gravity as a geometric property of space and time, or spacetime. It posits that massive objects cause a distortion in spacetime, which is felt as gravity. This theory, developed by Albert Einstein in the early 20th century, revolutionized our understanding of gravity and has far-reaching implications for both physics and mathematics. In this hierarchy, General Relativity falls under Field Theory, which is a subfield of Mathematics, itself a branch of Science. It is closely related to the study of tensors, differential geometry, and partial differential equations. The theory has been confirmed by numerous experiments and observations, including the bending of light by gravity and the slowing down of time in strong gravitational fields. It also provides the foundation for the modern understanding of black holes and the expansion of the universe.