For years, I have been understanding the bridge as the part leading into the last chorus, and pre-chorus as the part leading into the choruses before last. But recently I found out my understanding might be incorrect after learning of the term "middle 8". What I have been calling the "bridge" might be the "middle 8", and what I have been calling the "pre-chorus" might be the "bridge", but then where would the "pre-chorus" be?
I have been reading a lot of results on Google but none succeeded to provide a satisfactory answer to my question; and a lot of them just outright have conflicting opinions, so I think it's best to bring the question here. If it helps, the context here would be about pop music in general.