difference between " Thank You " and " Thanks

hello

it just came in mind those two normal words we all use all time " Thank You " and " Thanks "

Thank You and Thanks are very nice and comforting words , they explain how greatful you are and show the other side the deserved respect
they two have the same meaning
but when we should use each one of them?
everyone of them has its own situation to use
Thank You : it should be used with someone whom you do not know very well
Thanks : it could be used with relatives and friends only, you cannot use it with a stranger < it is some kind of being polit