Studies on the human language system have brought to the fore two key aspects. First, the prime function of language is communication. Second, language exists in the social world. The language learning process takes place within the sociocultural context and the relevant macrostructures that influence language use and development. According to the emergentist perspective, during the language learning process communication plays the central role in the emergence of a language system in a learner. Thus, the grammatical structures emerge through discourse as a result of the interaction between the learner and the environment. This article explicates, from the emergentist perspective, the vital role of communication, particularly authentic communication, in the emergence of linguistic structures. It also sums up the pedagogical implications of this understanding.