In casket construction, what does the term 'interior' usually refer to?

The term 'interior' in casket construction primarily refers to the internal components of the casket. This includes elements such as the lining, padding, and any fabric used within the casket that provides a comfortable and aesthetically pleasing appearance inside. The interior is critical for the overall presentation of the deceased, as it enhances the visual appeal during viewings and memorial services.

Understanding the interior components also highlights how they contribute to the overall functionality and comfort for the deceased's family and friends during the mourning process. While the other options pertain to different parts of the casket's construction, such as its external appearance or structural framework, the interior specifically relates to the internal aspects that have a direct emotional impact on those who are paying their respects.