In answering this question, don't give the generic: "I want to work for Amazon because they are one of the world's largest ecommerce companies/a leader in customer service and satisfaction." The people interviewing you know this already and have probably heard it hundreds if not thousands of times already. Give a unique answer such as how Amazon has impacted you specifically. If you can weave in how the team you're applying for has impacted you in a way it will only help.