The document discusses Noam Chomsky's theory of Universal Grammar and the innateness of language. It argues that children cannot learn language from environmental stimuli alone, as the stimuli are too impoverished. Rather, children must be born with an innate, biological capacity to acquire language - an innate "language organ" called Universal Grammar. Universal Grammar consists of universal principles that are shared by all languages, as well as parameters that vary between languages and are set during language acquisition. Chomsky's theory challenged behaviorist views of language learning and emphasized that language is a uniquely human cognitive capacity.