"If we hire you, what will we know about you a year from now?"
Don't all hiring managers wish they had a crystal ball to tell them whether or not you'll be a good hire? Maybe that's the wish behind this question.
If an interviewer asks you what the company will know about you after they hire you, you can answer it with the suggestions I give you in the video below. Click on the video to watch.
Read my blog article that goes into more detail about how to answer this question: How to Answer Interview Questions - Q30. It's part of my blog series, How to Answer Interview Questions, 101 tough job interview questions and answers for you.