Yes and no. If you have the hardware resources to run UNIX/Linux then you should. DOSBox can run any DOS program in UNIX, so there is no need for DOS if you can run UNIX. However, if you have an older computer or an embedded system where UNIX or Linux would have too much overhead, DOS is a better choice.
No difference, really. Unix is an OS (Operating System)
It's one of the first Windows operating systems.
unix.
UNIX is a command-based OS. In contrast, Windows is a menu-based OS.
kernel is everything in unix os
Why do you believe this is necessary? What OS are you talking about?
I assume OS means Operating System ... in computers. Here are some Windows PCDOS Dr DOS MSDOS
LINUX and UNIX are vendor independent OS
Hewlett-Packard Unix. It is a series of computers that runs the Unix OS. Most people recognize the HP as a computer company in the acronym. This their version with the Unix OS.
Unix is a specification. Mac OS X is a certified implementation of Unix. This like asking "What is the difference between a turtle and a red-eared slider."
Windows, Unix, Mac OS
Yes.