This is a general question related to the field of machine learning. While it has some technical aspects, the interviewer uses it to better understand your communication style and your ability to discuss technical terms in simple, easy to understand language. The trick to these types of questions is not to overcomplicate them and spend too much time answering them. As with most interview questions, be brief and to the point, will serve as your best strategy. The interviewer will ask you a follow-up question if they need additional information.