The central focus of this module is how languages are learned. In the field of language acquisition a distinction is often drawn between the acquisition of a first language (the mother tongue) and the learning of a second language. From the title of the module, Second Language Acquisition, it is clear that more attention will be given to how second languages are learned. However, first language acquisition is not entirely irrelevant here either. In order to gain a fuller appreciation of how the learning of a second language takes place, from time to time we will need to compare it with first language acquisition.