Answering this question gives the hiring manager an idea of what your goals are, your work ethic and your overall personality.
Believe it or not, this question doesn’t really have a right answer.
To be able to tackle this question successfully, you need to know the company's background and yourself.
A sample answer may sound something like this:
“Success is setting a goal, planning the steps required to achieve it, and effectively implementing that plan. Once I think I’ve achieved that goal, I’ve succeeded.”