"Why do you want to attend this college?"
This question, like all the others, is about you. It is a continuation of the task of the main essay (and the whole application, really): to make yourself sound interesting to the admissions evaluator. The college is an academic institution, first and foremost. What they are looking for is what you want to do intellectually, and why you want to do it at their college. So, you need to research either by visiting the college or online: what kinds of courses they offer, how their curriculum is unique, whether you can do research as a student, what their professors are like, what subjects are needed for general education or core requirements, etc. Then write about how you will use their intellectual resources.