This question is asked by interviewer to know your awareness to the job profile. So based on your answer they will decide what role or position they will assign to you. For instance, if you say that call center is about dealing with customer problems they will put assign you customer associate Role. On the contrary, if your answer is that a call center is a new business zone, where youngsters are employed in numbers and get an opportunity to develop their career, they might put you in a HR department.