The document explains speech acts as utterances that achieve specific effects, with three main types: locutionary (the act of uttering), illocutionary (social function of what is said), and perlocutionary (the effect on the listener). It highlights different classifications of speech acts by Searle, including assertive, directive, commissive, expressive, and declaration, each serving distinct communicative purposes. The document emphasizes the importance of understanding speech acts for effective communication.