Windows 15 is a very software-compatible version of Windows and the successor to Windows 14, which was released in 2029. Examples of Windows 15’s features are a new sleek Edge design, built-in third party theme support, Microsoft 745 and Microsoft Visual Studio 2030 pre-installed with the OS, and Windows 1.01 through Windows 14 app compatibility. The OS is very developer friendly.
FYI: This is 2021.