The document discusses intonation in speech and its various forms and functions. Intonation refers to the melody or pattern of pitch changes in speech. It includes tone units, prominence, tone, accentual function, grammatical function, attitudinal function, discourse function, and indexical and psychological functions. The document emphasizes learning intonation through both intuitive and explicit instructional approaches with realistic goals of improved intelligibility, communicability, confidence, and self-monitoring abilities.