Understanding the Windows Unified Update Platform
Among the various changes that Windows 10 brought to desktop environments, perhaps none has been as profound as its changes to basic update mechanisms. Introduced in 2016, Microsoft’s Unified Update Platform (UUP) applies to the Windows Update service that delivers Windows updates, including via Windows Update for Business (WUB), Windows Server Update Services (WSUS), and Microsoft Configuration Manager (ConfigMgr), as well as for Windows 10 and 11 instances that use the built-in Windows Update facility.
Thus, UUP is worth digging into, because understanding it reveals how Windows updates work, where they can go wrong, and how to fix them.
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Story added 29. March 2023, content source with full text you can find at link above.