Windows 3.1 is an operating system released by Microsoft in 1992. It introduced a graphical user interface that made it easier for users to interact with their computers. This version allowed users to run multiple applications simultaneously and featured improved performance and stability compared to its predecessor, Windows 3.0. One of the key features of Windows 3.1 was its support for multimedia, enabling users to play sound and video files. It also included a variety of built-in applications, such as File Manager and Notepad, which helped users manage files and create documents more efficiently.