The Energy-Momentum Tensor is a mathematical object used in physics to describe the distribution and flow of energy and momentum in spacetime. It encapsulates how matter and energy influence the curvature of spacetime, which is a key concept in Albert Einstein's theory of General Relativity. This tensor provides a way to understand how different forms of energy, such as kinetic and potential energy, interact with gravitational fields. In essence, the Energy-Momentum Tensor contains components that represent energy density, momentum density, and stress (pressure and shear). It plays a crucial role in the Einstein field equations, which relate the geometry of spacetime to the energy and momentum present, helping to explain phenomena like black holes and gravitational waves.