Computational physics is a sub-discipline that employs numerical analysis and computer simulations to solve complex physical problems that are often intractable with purely analytical methods. Functioning as a crucial bridge between theoretical and experimental physics, it allows scientists to model and investigate phenomena ranging from the quantum behavior of materials to the large-scale evolution of the cosmos. By developing algorithms and leveraging computational power, this field not only tests theoretical predictions but also guides the design of new experiments, effectively serving as a third pillar of modern scientific inquiry in physics.