MS-DOS doesnt even exist in newer operating systems, it has been replaced by a command line interface which is like MS-DOS called cmd.exe.
cmd.exe is an interface to give you access to commands such as telnet, netstat, ipconfig and lots lots more, most of which can be used for hacking or gathering useful information to help with hacking.
BAT files are just a way of taking these commands and running them one by one in a script like way, people have and still do exploit this to make viruses that will wipe entire harddrives or as a sneaky way to get the user to download trojans and backdoors. Other people will use it to make jobs such as telnetting to 10 different computers an easy task to do.
I dont think anything more on the subject needs to be said, unless I need correcting.
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