This is a personal question that allows the interviewer to understand what is important to you and what you're seeking in your next role. Consider things like work-life balance, teamwork, and collaboration, strong leadership, ability to make an impact, growth and development, advancement opportunities, etc. Avoid speaking negatively about a previous employer or mentioning things like a toxic work environment or poor leadership, and try to focus more on the positive perspective of what you're seeking, instead of the negative aspect of what you're leaving.