Intonation

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as can be seen at Wikipedia:

Intonation is the tone that is used when speaking, as the name might suggest.

Rising intonation means the pitch of the voice goes up; falling intonation means that the pitch goes down. For example, northeastern American English has a rising intonation for questions, and a falling intonation for statements.

Many languages use intonation to convey surprise or indicate that a remark is a question. Some languages use intonation to convey meaning: they are known as tonal languages.