“I’ve heard great things about the work environment here from a few colleagues. And when I saw this job posting, it seemed to match my skills very closely. For example, I saw on the job description that you need somebody who’s an expert in Java programming. This is what I focused on in both of my previous positions, and was even the focus of my academic work before graduating university. I consider myself an expert in Java and it’s a skill I hope to continue specializing in.”
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.