Keep your response short and focused. You want your answer to be brief. Select one or two specific qualities from the list you created to emphasize in your “sales pitch.” If you aren’t sure how to decide which to include, take another look at the job description and use your analytical skills to determine which qualifications would add the greatest business value. 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.