This oft-dreaded question actually isn’t that difficult to answer, despite how open-ended it leaves itself. If you’re pursuing a job in customer service, you need to know how to answer this with confidence and sincerity, even if customer service isn’t a career you love fundamentally and want to stick with for the rest of your life.
If it helps, think back on the last time you experienced amazing customer service. What did the person do that stood out to you? Now, channel that positive experience into a general principle. What do you hope to achieve with this job? Do you aspire to be as genuinely helpful and polite as the good customer service people you’ve dealt with in the past?