Light scattering has become an important tool for investigating elementary excitations in the materials, through theoretical and experimental studies. In this context, several techniques allow the study of the inelastic light scattering process, among which Raman and Brillouin scattering stand out. While their scattering mechanisms are the same, they differ in their experimental arrangements. A class of materials that has attracted great interest for the study of this topic is magnetic materials. In this Journal Club, we will present the basic concepts of light scattering and magnetic excitations (magnons) in magnetic materials. Moreover, we will discuss the importance of magnon interactions in magnetic properties.