Denatured alcohol is a type of liquid that people use for cleaning things or making stuff like paint or other things. But it's not the same as normal alcohol that people can drink because it has some other stuff added to it. This stuff makes it not taste good and can even make people sick if they drink it. So denatured alcohol is made in a special way to be used for things other than drinking. It's like making a special kind of juice that tastes bad on purpose so people won't drink it.