Your question is Explain Your Contribution. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
Can you explain the contribution in XXX project shown on your resume?
Please focus on your specific responsibilities rather than describing the entire project. Cover the problem, your decisions and actions, how you collaborated with others, and the measurable result. Be prepared to clarify what you personally owned, what changed because of your work, and what you learned.