If your HR asks if you are familiar with any content management systems, such as WordPress or Drupal, they are likely trying to determine your technical skills and experience with managing and maintaining a website. A content marketer needs to be familiar with at least one content management system to effectively manage and publish content on a website.  If you are familiar with content management systems, you should be prepared to discuss your experience with them. Here’s how you can do it:  "Using a content management system, I built and managed so-and-so websites and handled so-and-so customization and plugin developments.  If you are not familiar with content management systems, it is still important to be honest with the interviewer and let them know what you are comfortable with. Here is what you can tell them:  As of now, I am not aware of either of them, but I surely have an interest in learning more about content management systems. But I do have some relevant technical skills that could be transferable to working with a content management system.”