Two elex centres targeted, councillor and others killed

What emotions or feelings might the phrase 'Bye bye' convey?

In what contexts might someone use the phrase 'Bye bye'?

How does the phrase 'Bye bye' differ from simply saying 'Goodbye'?

What cultural significance might the phrase 'Bye bye' have in different languages?

Can you think of any songs or media that feature the phrase 'Bye bye'? What are they?