This question is often tricky to answer especially in an interview. You just need to find the things you did and should focus on showing the recruiters and everybody else on what you did than what you did not. It does not matter if you took a break for personal reasons such as traveling, just be honest about it.
One tricky way to avoid telling about your employment gap is by choosing you to resume format smartly by either showing only year style duration so that you can skip having to explain anything.
If it was a longer break or if you have mentioned you taking a break to emphasize any charity work that you did and the new things that you learned which will help you return with new vigor and a polished skill set.
Lastly, be confident about it as it is not something to be afraid about, you took a break because you needed it, it is better than doing a half-hearted job.
All the best!
