DirectX 11.1 is a set of application programming interfaces (APIs) developed by Microsoft that enhances the performance and capabilities of multimedia applications, particularly in gaming. It provides developers with tools to create more realistic graphics and improved audio experiences on Windows operating systems. This version builds upon its predecessor, DirectX 11, by introducing features like improved support for Windows 8, better resource management, and enhanced support for hardware features. It allows for more efficient rendering techniques, which can lead to smoother gameplay and higher-quality visuals in compatible games and applications.