Yang-Mills Theory is a fundamental framework in theoretical physics that describes how certain types of force fields interact with particles. It generalizes the concept of gauge symmetry, which is essential for understanding the behavior of particles in the Standard Model of particle physics. The theory is named after physicists Chen-Ning Yang and Robert Mills, who developed it in the 1950s. In Yang-Mills Theory, the forces are mediated by gauge bosons, which are particles that carry the force. For example, in the case of the strong force, the gauge bosons are called gluons. This theory plays a crucial role in explaining the interactions between fundamental particles, contributing to our understanding of the universe at its most basic level.