Keep in mind, not every employer is looking for a certified scrum master.
So just because you don’t hold a certification doesn’t mean you should be worried about this question.
If you are concerned, however, let the interviewer know you’d be more than happy to get certified to fulfill the position.
And if you are currently certified, be sure to mention a few details about why you decided to get certified and when and where you obtained it.
You may also be asked to explain your understanding of the biggest key terms in this area of expertise.
These questions are designed to assess your skill level so it pays (literally, in the form of compensation) to know what you’re talking about here.