Asking about a technical writer's key roles and responsibilities helps the interviewer understand your approach to this job and some of the activities you emphasize. This will enable them to determine if you are a good fit for the job and their organization. If you spent time researching the company and reviewing the job posting before the interview, you should have no problem answering this question. Your answer should contain elements of the job posting, address any challenges the organization may be facing, and be based on your experience in this role and the skills you bring to the position.