Print on Demand or PoD services, in essence, allow printing the required number of copies based on custom order volumes.

The company doesn’t need to buy a large batch of printed products at once, like when you order from the studio and print publishers, allowing you to order the exact quantity to be sold and distributed...
https://multi-programming.com/for-clients/10-features-every-print-on-demand-provider-company-must-have