Linguistics is the scientific study of natural language. It encompasses various sub-fields including the study of language structure (grammar), meaning (semantics and pragmatics), sound systems (phonology), word formation (morphology), and how words combine into phrases and sentences (syntax). Other areas of linguistics explore language acquisition, historical change, social contexts, representation in the brain, and more. The goal is to understand both what is universal across languages as well as how and why languages vary.