This is the 11721st most frequent Russian word.
заводу
"Заводу" is the dative case of "завод," meaning "to the factory" or "for the factory."
In this sentence, 'заводу' is used in the dative case, indicating motion towards the factory.
Я иду к заводу, чтобы посмотреть на его работу.
I am going to the factory to observe its work.
Here, 'заводу' is also in the dative case, used after the preposition 'у' to indicate proximity to the factory.
В пейзаже видно старый мост у заводу.
In the landscape, one can see an old bridge near the factory.
In this example, 'заводу' is in the dative case, showing the indirect object that benefits from the action.