Semi-classical gravity is a theoretical approach that combines the classical understanding of gravity from Einstein’s general relativity with quantum field theory, which describes the behavior of matter and energy at very small scales. In this framework, spacetime is treated as a smooth, classical fabric, while quantum fields evolve within it. This is important for studying extreme environments—such as black holes or the early universe—where quantum effects can significantly influence gravitational behavior. Semi-classical gravity provides key insights into phenomena like Hawking radiation and is an essential stepping stone toward a full theory of quantum gravity.