Show how you will add value. For each qualification or strength that you’ve identified, think of a specific time where you used that trait to achieve something. Think about any other skills you may have that would add extra value, or any previous professional, personal or volunteer experiences that provide you with a unique perspective. Ultimately, this is your chance to tell the interviewer why you would be an invaluable employee.
Any candidate can read and regurgitate the company’s “About” page. So, when interviewers ask this, they aren't necessarily trying to gauge whether you understand the mission—they want to know whether you care about it. Start with one line that shows you understand the company's goals, using a couple key words and phrases from the website, but then go on to make it personal. Say, “I’m personally drawn to this mission because…” or “I really believe in this approach because…” and share a personal example or two.