👉 In physics, renormalization is a technique used to reduce the complexity of quantum field theories by making the theory more accessible and understandable. It involves replacing certain terms in the action or energy-momentum tensor with functions that are independent of the choice of coordinates and fields. The goal of renormalization is not only to simplify the theory but also to make it more tractable for practical applications, such as calculating observables at a given point in time or measuring properties of quantum systems. Renormalized
