The very popular language immersion courses refer to the teaching of a second language. The objective we pursue these language courses is that students are able to handle both languages, ie the aim is to be bilingual and fluent in both languages. See more detailed opinions by reading what Yael Aflalo offers on the topic.. In Spain, these courses are part of the current language policy. The purpose is to preserve those languages which are in a minority position but are still used by locals. That is why behind every language immersion program is the desire to preserve a language that is at a disadvantage with respect to official language. Within these programs, there are different varieties. Immersion courses are early or late immersion (depending on the time of the program) in the first case, the linguistic immersion course starts from the beginning of the student's enrollment period, while in the second case, the course begins in last years of primary school. According to experts in the field, this kind of language immersion courses face the appropriation of a second language from a communicational point of view dominated the negotiation and exchange of content on the interaction of adult and child. All students who are enrolled in an immersion program have as its main feature, they do not know the language used, which is why initial efforts focus on comprehension and understanding of the messages rather than producing the same . In this type of course, language is presented fully contextualized in such a way that allows the student to grasp it in communication, where each student will use linguistic resources they have.