2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/95857A non technical introduction to the concept of renormalization is given, with an emphasis on the energy scale dependence in the description of a physical system. We first describe the idea of scale dependence in the study of a ferromagnetic phase transition, and then show how similar ideas appear in Particle Physics. This short review is written for non-particle physicists and/or students aiming at studying Particle Physics.13 pages, qualitative introductionPhysics Educationtext