Diffuser vs humidifier: what’s the difference?

A split image on a pink and blue background showing a white ceramic diffuser and a blue and white humidifier.

Listen up gals, the time has come to stop using the terms “diffuser” and “humidifier“ interchangeably. "Why?" you ask. Well, because they’re (apparently) two totally different devices. Yep, really. 

JSYK, while they might look similar and they might even appear to do the same thing but they actually do work differently and have rather unique purposes.