How do hoppers work ?

[Reize81]

I am reading the forum for a while.

Often reading that you can use hoppers and a food dispenser to feed prisoners. But how does a hopper work ? I never built one. I am tight on resources right now and don't want to waste any. Help ? Thx !

[Reize81]

does the hopper need to be indoors ?

[Shinzy]

does the hopper need to be indoors ?

No it only needs to be adjacent to the nutrient paste dispenser