This document provides an overview of speech acts and performative utterances in linguistics. It defines a speech act as an utterance intended to provoke a specific response or action from the listener. Speech acts can include requests, warnings, promises, apologies, and greetings. The document then discusses the difference between performative and constative utterances. Performative utterances both describe and perform an act, like saying "I promise." while constative utterances only describe. It provides examples of performative verbs and how to identify performative utterances using the adverb "hereby."