A vaporizer is a special device that you use to breathe in medicine or other things that can help you feel better. It works by heating up the medicine or substance and turning it into a kind of steam or vapor that you can inhale.
It's kind of like when you take a shower and the hot water makes steam that comes out of the showerhead. But instead of water, a vaporizer makes a special kind of steam that is easier for you to breathe in because it doesn't have any smoke or harmful things in it.
You might use a vaporizer if you have a cold or cough and need to breathe in medicine to help you feel better. Or you might use it if you are trying to quit smoking and want to inhale a substance that's not as harmful as cigarettes.
There are different kinds of vaporizers, but they all work by heating up the substance and turning it into a steam or vapor that you can inhale. Some come in big machines that you plug into the wall, while others are small enough to fit in your pocket.
Remember, always ask a grown-up before using a vaporizer and follow their instructions very carefully!