UK: Prince William visits the England Women's Football team while they train at St George's Park

What do you think the response 'Yeah.' signifies in a conversation?

In what contexts might someone respond with 'Yeah.'?

How does the tone of the word 'Yeah.' change its meaning?

Can 'Yeah.' be considered a complete response? Why or why not?

What emotions or attitudes might be conveyed through the use of 'Yeah.'?