Bon Jour !! What is the difference between: s'il te plaît -and- s'il vous plaît ?

Bonjour Martin,

You would say the familiar 's'il te plaît' to someone you say 'tu' to-  so children, family members, friends etc...

and the more respectful 's'il vous plaît' to someone you say 'vous' to - so strangers, in shops, to people you don't know very well, or elderly people not part of your family etc...

Hope this helps!