You probably already recognize this as a technical question since it asks you for a definition and then requests that you discuss the term in the context of a machine learning engineer's role. Keep in mind that when answering technical questions, you should be brief and to the point. This encourages the interviewer to either move on to the next topic or ask a follow-up question if they have a specific interest in this area. Pursuing this strategy will help you define what is important to the interviewer so you can begin to tailor your answers to better match their needs and the position's requirements.
