Quality is delighting customers
In Simple terms, to understand you in very few lines!!!!
What difference you will bring up IF you join the company, there is existing team who are there to test and certify application. But if you join the team what are things you will bring up so that QUALITY will improve to much more level.
Answer: Share your "Strength" to show your talent and what difference you can bring for the team or the company if they hire you.