By asking this question, the interviewer is seeking to understand two things. The first is whether you are familiar with the tools and languages they currently use for their web development efforts. The second thing they want to understand is whether you took the time to research their company and learn about their processes. Interviews are often won or lost before you even arrive, based on the amount of research you do and what you learn about the job and the company. The better you understand their operations, the more successful your interview will be, and the more likely they will offer you the job. You can answer those in either a positive or negative manner.