<human>:  Why did the Romans use aqueducts?
<bot>: The Romans used aqueducts to transport water to their cities. Aqueducts were often built to supply fresh water to people and animals, but they could also be used to transport water from one place to another. Aqueducts were often built to carry water from rivers or lakes to cities, but they could also be used to carry water from one place to another.