The Wayback Machine - https://web.archive.org/web/20161118053320/https://developers.google.com/cloud-print/

Applications submit print jobs to the service via the web-based common print dialog or API offered by the service. Google Cloud Print then sends the print job to the selected printer which the user has previously registered with the service. A new class of Cloud Ready printers connect directly to the service and offers the best user experience. Non-cloud printers connect to the service via a software connector.

What is Google Cloud Print?

Application Development

 A resource for application developers looking to enable Google Cloud Print printing in their web, mobile, or native apps

Printer Development

 A resource for developers building printers and printing software integrated with Google Cloud Print services

Cloud Device Description

 A format to express capabilities of a cloud-connected device, such as a Google Cloud Print connected printer

Privet Local Discovery

 Cloud Device Local Discovery API