Why Window's operating system is providing DOS,while DOS is itself a Operating system.?

Question

Why DOS is made compatible with Window, what is the reason for providing other operating system with windows.

Answer 1

Why Window's operating system is providing DOS,while DOS is itself a Operating system.?

Answer 2

Windows was a graphical user interface shell which operated by issuing msdos commands to operate the programs and other tasks until 98. The ME version was a transition to msdos-free operation as the dos was not compatible with some 32 and 64 bit systems