Second Language Acquisition (SLA) is a very heated subject for people to discuss, but what is “Second Language Acquisition?” It can be defined as the way in which people learn a foreign language other than their mother tongue, inside or outside a classroom, and second language acquisition as the study of this.
Most learners, if they have the chance, probably develop their L2 proficiency by both Learning and Acquisition. The extent to which each route to proficiency is important will vary according to the context in with the language learning is take place. So, for example, most learners of English in China, who have little contact of with the L2 environment, are likely depend mostly on conscious classroom Learning to improve their English, at least at the early stage.