question of, "Why do you want to work here?" is not limited to job interviews. You’ll find it knocking on your door in networking, informational interviewing, and even at job fairs.
When you are asked this innocent-sounding question, you need to have a strong answer. Your answer should demonstrate your knowledge of the company and the skills, talents, experience, and strengths you have that are a match for their culture and the targeted position/department.