The document discusses speech acts, which are meaningful utterances that people perform through language. Speech acts were first coined by philosopher J.L. Austin and later developed by John Searle. There are three components of a speech act: the locutionary act of literal utterance, the illocutionary act of intended meaning, and the perlocutionary act of impact on the listener. Searle classified speech acts into five categories: directives that demand action, commissives involving promises, representatives stating beliefs, declaratives that change situations, and expressives conveying attitudes. Speech acts allow people to exchange information, attitudes, and socialize through everyday language use.