With this question, your interviewer is seeking to first see what types of banking products you are familiar with by having you talk knowledgeably about the products that you use. Then, under the surface, your interviewer will be looking to see how you can help sell similar services to the customers at Westpac New Zealand Limited if you were hired for this role. As you answer the question, try to take a salesperson type of approach by highlighting the features and benefits of the services that you utilize with your current bank. Explain how they help you become more effective and efficient with your finances to really help your interviewer see that you have the sales type of approach if hired for this position.