By asking this question, the interviewer wants to understand what success means to you and what feeling it brings out in you. By this, they can ASSESS your CONCERNS for the growth of the company along with your personal growth.

Sample answer:

There was a time in my previous company where I was handling a project related to blogging that would POTENTIALLY inspire a lot of people. So I worked on researching what topics would people get inspiration from and what would help them be better. I also conducted a survey which I shared with my friends, neighbors and relatives to get better insights about this. When we published the blog, the recognition that we got was tremendous. People LOVED how relatable the posts were and this turned out to be a significant reason behind the 90% sales of our products. I was very happy with my work as I did my part in contributing to company profits as well as providing a platform to people where they can get inspiration from.