When there is no live code testing, interviewers usually ask such questions in order to gain insights into your practical knowledge about backend development. There does not exist any concept such as perfect code. Debugging is important to identify potential flaws in a software program. It is the process of identifying the bugs and fixing them at the right time to ensure the optimum performance of the application. While answering this question, you will have to name a few debugging tools that you use to fix the issues in the applications. You also need to mention the different steps for fixing the potential issues. Remember, different bugs are handled in different manners. So, you need to answer this question accordingly.