Microsoft Windows 8.1 Pro is a personal computer operating system that is part of the Windows NT family. It introduced significant changes to the Windows OS and its user interface (UI), targeting desktop computers and tablets. This touch-optimized platform is based on the modern Metro design architecture, which specifies how applications are delivered and rendered in the UI.
Released by Microsoft in 2013, Windows 8.1 Pro has received numerous updates and improvements, including pre-activation. This means the activation process is already completed, allowing immediate use after installation.