The document discusses speech acts, which are actions performed through utterances. It defines speech acts, acts of referring, acts of assertion, performative and constative utterances, and performative verbs. Speech acts go beyond just producing words - they allow speakers to perform actions like firing someone or making requests. Referring expressions are used to pick out particular entities. Assertions describe states of affairs but are not necessarily performative. Performative utterances both describe and perform an act simultaneously through language. Constative utterances make assertions without being performative. Performative verbs can make an utterance performative when used in the first person present tense.