Can somebody explain to me what is the difference between contribution and motivation in any research paper?
Motivation: why is this an important problem? Why should anybody care about this?
X affects tens of thousands of consumers in the United States each year, and costs companies billions of dollars.
If we can solve X, we are one step closer to solving the biggest open problem in the field, Z.
Contribution: what is the new thing (result, approach, technique, whatever) that this paper describes, that advances the state of this field?
This paper describes a way to do X using Y, which is up to 200 times faster than the current state of the art.