Q:

Difference between "yup" and "yes"

Possible Duplicate:
“Yes”, “Yeah”, “Yep” 

What is the difference between yup and yes? Most of the time I use yup instead of yes.

A:

Yup and its more common variant Yep are informal ways of saying Yes.
The only difference is one of formality.  Use Yup only in informal (casual) settings; not, say, in a business meeting.

A:

Yup is the slang (informal) alternative to Yes. You shouldn't use it in formal cases.

