The phrase designates physical, printed books available for purchase via electronic book retailers. For example, a hardback novel offered through an online bookstore alongside its digital counterpart falls under this categorization.
The continued availability of physical editions is important for various reasons. Some readers prefer the tactile experience of reading a printed volume. Physical books also retain intrinsic value as collectibles and can serve as tangible representations of knowledge or aesthetic appreciation. The historical preference for printed materials influences contemporary book purchasing habits.