What is intonation?
Intonation is the change in pitch which occurs over the course of a phrase. It is generally used to signify information about the utterance, like:- whether it's a question or a statement
- which parts are new information and which are already known to both parties
- the attitude of the speaker towards the information
For example, you can use intonation (in combination with main stress, in English) to change...
"I never said she stole MY money" vs "I never said SHE stole my money"