Be honest with the interviewer about your knowledge of departments and what is sold. If you have a lot of knowledge and experience on the Home Depot products, that is great! If not, just tell the interviewer that you do not know a lot and you look forward to learning. You might say that you know the basics and that Home Depot offers plumbing, lighting, paint, flooring, appliance, electrical, garden, and tool department. You might also mention that you know Home Depot sells quality washers/dryers, kitchen appliances, tools, paint, patio furniture, flowers, plumbing, and much more!
"I have shopped primarily in your paint department and also purchased by flowers and patio furniture from Home Depot this past year. I love your affordable prices but also the fact that you have great quality offerings as well. I am interested in learning more about your other departments."