Controlling for Variables in Coffee Science Brewing Techniques

There is this idea of controlling for variables so that you can have a more nuance dial on your how your coffee ends up, how it brews. It seems to me that's the same process that we see in good scientific research where they control for things that you don't want to distort your results with. I ind this case, it's called the scientific wod is confounding. But what does that mean? That means like, your controlling further research.