Who defines language acquisition and did he say? ?

Language acquisition is typically defined by linguists and psychologists as the process through which individuals acquire the ability to understand and use language. One of the most well-known theories of language acquisition was proposed by Noam Chomsky, who argued that humans are born with an innate capacity for language and that this capacity is activated through exposure to language input in the environment. Chomsky's theory of Universal Grammar suggests that all languages share a common underlying structure and that children are able to learn any language they are exposed to because of this innate linguistic knowledge.