I lifted (scanned it) this from Alan Cooper’s book, About Face 3: The Essentials of Interaction Design.
I used to confused interaction design with interface design, and user experience design. So this graph/image helps me understand what user experience is about.
In the image you will see that user experience has 3 basic elements, form (interface), content, and behavior (interaction design).
This made me realize that user experience is not all about eye-candy looking interface. =)