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. They also want to understand 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.

"Before coming here today, I did quite a bit of research on your company and the development tools you use. First, I was very impressed with the level of technology and expertise you currently have in-house. Based on what I learned, I believe you use several languages, including JavaScript, Ruby, and HTM5. I'm very familiar with each of these and have used them in my prior positions. I'm confident I can begin immediately contributing to your development efforts starting on day one."