The update model Microsoft introduced with Windows 10. Rather than a new version every so many years with a new name (see
Windows versions), Microsoft releases "feature updates" and "quality updates" that retain the Windows 10 version name. See
Windows 10 updates and
Windows 10 versions.
Feature Updates
Feature updates are large, semi-annual releases that are completely new installations. Users can defer updating for 18 months or even 30 months for Windows 10 Enterprise or Education editions.
Quality Updates
Quality updates are known as "cumulative updates," "security updates" and "updates for Windows 10," which are automatically installed to fix bugs on the second Tuesday of the month (see
Patch Tuesday). Quality updates can be postponed for a month. See
Windows Insider Program.
Not Cloud Computing
Windows as a service (WAAS) moniker sounds like software as a service (SaaS), which is one of many available cloud computing offerings. However, WAAS is actually an update service. See
cloud computing.