Have you been in your job for a long time? Have you made lateral moves? Your job interviewer might ask why you haven't been promoted.
Not being promoted is not always a bad thing...there could be a lot of reasons for that. But if they ask, they're concerned and looking for any problems you might present to them if they hired you.
In the video below, I will give you several suggestions for ways you can answer this question in a positive way that alleviates the fears of that hiring manager. Click the video to watch.
Read my blog article that covers this topic in more depth: How to Answer Interview Questions Q99. It's part of my blog series, How to Answer Interview Questions, 101 tough job interview questions and answers for you.