This is the 11750th most frequent Russian word.
задние
"Задние" means "rear" or "back" in English.
The adjective "задние" modifies "сиденья", meaning "back" to specify the position of the seats within the car.
Я сел на задние сиденья автомобиля.
I sat on the back seats of the car.
Here, "задние" describes "ворота", indicating location and specifying that it's the gates located at the back section of the building.
Он посмотрел на задние ворота здания.
He looked at the building's back gates.
In this context, "задние" qualifies "ряды", identifying specific rows relative to their position within a spatial arrangement.