Usability vs User Experience

I have noticed there is lot of confusion to many people between the "User Experience Design" & "Usability". Let me try to explain in few words..!
"Usability refers to the ease with which a user can accomplish his or her goals using any tool. (...) Somewhat in contrast, user experience refers to the way a user perceives his or her interaction with a system. User experience design encompasses both interaction design and visual design and seeks to promote an interface that is pleasing to the user."