This document summarizes a chapter about intonation from an English phonetics and phonology textbook. It discusses the basic concepts of intonation including speech melody, tone languages vs intonation languages, and the 5 basic tones of yes and no questions. It then explains tone units and the different parts of a tone unit. Finally, it outlines various functions of intonation including attitudinal, discoursal, accentual, grammatical, emotional, textual, indexical, information structure, and psychological functions.