How do I make a batch file run strings as commands?

Question

I want to make a batch file to circumvent some cmd problems on my computer, but for that I need to be able to take String user input and run it as a command.

Basically what I want to be able to do is type in a command when the batch file asks for input, and have the computer run that command, similar to python's os module (class?)

Answer 1

Simply assign the string to a variable, then "execute" the variable as though it was a program

eg

set  myvar=ECHO Hello, World! %myvar%