The Ricci Tensor is a mathematical object used in the field of general relativity to describe the curvature of spacetime. It is derived from the Riemann curvature tensor and provides a way to summarize how matter influences the geometry of the universe. Specifically, the Ricci Tensor captures the degree to which volumes of space are distorted by gravitational fields. In the context of Einstein's field equations, the Ricci Tensor relates to the distribution of matter and energy in the universe. It helps determine how mass and energy affect the curvature of spacetime, influencing the motion of objects and the propagation of light. This relationship is fundamental to understanding the dynamics of the cosmos.