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I'd love it if more people understood the difference between hallucinations and illusions. So let me try to explain with examples. [TW: examples of auditory hallucinations and illusions described as you experiencing them]
1. Imagine you are home alone with your windows closed and it's silent. And then you hear unfamiliar voices talking about you, it sounds like they are coming from another room. You go to check but no one is there. Your brain created entire voices of people out of thin air. This is a hallucination. There is nothing but your brain creates something.
2. Now imagine you are in the same scenario but your windows are open but the curtains are closed. You hear your neighbors having a conversation, and you hear it as them talking about what you are doing in that moment. They couldn't possibly see what you are doing, so realistically they can't be talking about you, but your brain makes you change the words and hear it that way. This is an illusion. There is something but your brain changes the real thing into something unreal.
It's not always easy to know the difference when you are experiencing it. But if you do know which one it is (nothing there and something unreal appears or something there changes to something unreal) then I think it can be really helpful to label the symptom accurately.
For me it was helpful to gage the effectiveness of my medication. I noticed that I have more illusions than hallucinations, and for me that was a sign of improvement. It can also go the other way, to see if your psychosis is getting more severe.