Windows 8.1 is an operating system developed by Microsoft as an update to Windows 8. Released in October 2013, it aimed to improve user experience by addressing feedback from users. The interface features a combination of the traditional desktop and the modern Start Screen, allowing users to access apps and programs more easily. One of the key enhancements in Windows 8.1 is the return of the Start Button, which provides quick access to the Start Menu. The update also introduced new personalization options, improved search functionality, and better integration with cloud services like OneDrive. Overall, it aimed to create a more user-friendly environment.