Try to recall your answer to the original question when responding to a follow-up question. This will help you be consistent and will also indicate what additional information you can provide to the interviewer. Keep your answer brief and to the point, as with the original question. Don't be surprised if the interviewer asks you an additional follow-up question to two. This would indicate that the topic is of great interest to their organization.

"The main difference between an exhibit and a stack is that an exhibit doesn't have a fixed process for how to add or recover data. A stack uses a Last In, First Out (LIFO) approach. Using both of these in the programs I create provides the flexibility of how data is managed and presented to the users in a manner that best suits their needs."