Intonation refers to the rise and fall of pitch in speech and helps convey meaning. It has grammatical, accentual, discourse, attitudinal, and sociolinguistic functions. Intonation patterns include falling intonation, used for statements and questions, and rising intonation, used for open questions. Teaching intonation is important for clear communication and avoiding misunderstandings. Students should practice intonation through listening, repeating, and imitating native speakers.