And apparently residential places with compactors use what are called sausage bags, where you can fit multiple compacted rounds of trash into one single bag.
It's the things that you want to throw away that you won't use anymore and a compactor is is something that actually takes the trash and it makes it very small okay.
Compact means small and so a trash compactor is like a special garbage bin you put your garbage in it and you close it and you say compact and then it makes a loud noise.
I'm not really sure I never had a trash compactor in my home in America, but we always had a dishwasher and this was very very nice to have because you don't have to wash the dishes by yourself.