Print on demand books = print on demand publishing, which is a method of producing books in specific quantities that are needed to meet an ongoing bookstore, or book buyer's, orders.
Printing on demand is a book distribution method that was made possible by digital printing (also inseparable from digital printing). It prints books only in response to orders, and only prints the exact amount ordered. Due to the capabilities of digital printing, print on demand is actuallu capable of filling an order for one book profitably.
