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Windows 8 is a personal computer operating system developed by Microsoft as part of the Windows NT operating system family. The development of Windows 8 began before the launch of its predecessor, Windows 7, in 2009. It was announced at CES 2011 and followed by the release of three previous versions from September 2011 to May 2012. The operating system was released to the On August 1, 2012, and was released for general availability on October 26, 2012. Windows 8 introduced major changes to the operating system platform and user interface to enhance its tablet user experience, where Windows now competes with mobile operating systems, including Android iOS. In particular, these changes include a Windows-optimised shell based on Microsoft's "Metro" design language, home screen (which shows programs and content dynamically updated in a mosaic grid), a new platform to develop " Applications "Emphasis On touch screen entry, integration with online services (including the ability to synchronise applications and configurations between devices) and Windows Store, an online store to download and purchase new software. Windows 8 added support for USB 3.0, advanced format hard drives, near field communications, and cloud computing. Additional security features such as integrated antivirus software, integration with the Microsoft Smart Screen phishing filtering service, and support for UEFI Secure Boot have been introduced on UEFI firmware-compatible devices to prevent malware from infecting the boot process.

Windows 8 was released to a mixed critical reception. Although the reaction to its improved performance, security enhancements and improved support for touchscreen devices was positive, the new operating system user interface was widely criticised for being potentially confusing and difficult to learn, especially when Used with a keyboard AND a mouse in place of the touch screen. Despite these shortcomings, they have sold 60 million Windows 8 licenses through January 2013, a number that includes updates and sales from OEMs for new PCs.

On October 17, 2013, Microsoft released Windows 8.1. It addresses a few of Windows 8 that were criticised by reviewers and early adopters and incorporate additional improvements to those of the operating system. Windows 8 was finally succeeded by Windows 10 in July 2015. Support for Windows 8 RTM ends on January 12, 2016; For Microsoft Life cycle Policies Regarding Service Pack, Windows 8.1 must be installed to maintain compatibility and receive additional updates.