The interviewer wants to hear that you understand the industry of Home Depot's company. Think about your experiences in retail stores. What have you observed? What types of things are the employees working on? You might mention that customer service is very important to keep your members coming back to your store. You might share that organization/tidiness is necessary to keep the store visually appealing. You might discuss that there are many moving pieces such as merchandise being ordered, new displays being built, stocking merchandise every day, cashiering, ensuring lines are not too long, member service, sales analysis, and general operations. Be prepared to discuss 5 or 6 things that you have recognized about the retail setup.