Back in the day when I first started programming in Unity (during COVID) this was probably one those hard concepts to wrap my head around. I kept mixing them up, and didn't know which one to use when. When I did a google search I was left even more confused! I thought, hey, now that I actually understand the whole thing; why not write an article about it because it's actually really simple.
So, do you use a UnityAction, or do you opt for a UnityEvent? They sound kind of the same. They show up in similar places, and yet mixing them up in the wrong context can leave you debugging phantom null references for a loooooong time, wondering why your inventory system just... stopped listening.
So, let me try to explain it in my own words and hopefully I can make some sense of it all, including exactly when to use UnityEvent in Unity, and when it's just adding overhead for no reason.
