Pragmatics is a subfield of linguistics that studies how context contributes to meaning in human communication. It examines how language is used in social situations and how people make language choices based on their audience. Some key concepts in pragmatics include deixis, which uses expressions like pronouns to point to people, places, and things in context; reference and inference, which looks at how speakers choose referring expressions based on their assumptions of a listener's knowledge; and speech acts, which are the actions performed through utterances like apologies, requests, etc. Politeness is also an important aspect of pragmatics, as it examines how people maintain each other's public self-images and use face-saving language choices in