Win11Debloat is an open-source PowerShell script (MIT, about 60K GitHub stars) that removes preinstalled Windows 10/11 apps, turns off telemetry and ads, disables Copilot and Recall, and tweaks the taskbar, context menu and File Explorer with a single command. This guide covers three ways to run it, exactly what Default Mode changes, which apps it removes, five ways to undo it and the risks to know first.