Due to the relevance and great importance that multilingual teaching has gained in recent years in the European educational sphere, there is a need to study and apply new methodological approaches in our classrooms that promote language learning, and therefore, CLIL methodology is considered to be one of the most innovative. For this reason, the aim of this book is to show the importance and necessity of the study of languages integrated with the learning of contents, how to carry it out in our classrooms and what material resources can be used from this new methodology. First of all, it will be approached from the Spanish educational sphere and later on it will also show how this same CLIL methodology is used abroad. Finally, this book explains and clarifies what objectives this approach promotes and what learning strategies are promoted through this methodology.