What does the ion switch on my hair dryer mean?

The package says it's supposed to dry your hair faster than with it switched off.

Eh, I just leave it on, it doesn't hurt.

It doesn't put out cold air.

What does the ion switch on my hair dryer mean?

I believe an ion switch is when the blow dryer blows cool air. After blow drying normally, hit the ion switch and the cool air will close down the cuticle in your hair and your hair will be a lot softer.