Would a step-up transformer or a step-down transformer be used to convert 260 volt AC from a household input into a 13 volt AC output in a portable electric fan?

A step-down transformer would be used to convert 260 volt AC from a household input into a 13 volt AC output for a portable electric fan. This type of transformer decreases the voltage, allowing the fan to operate safely and efficiently at the lower voltage required. Using a step-up transformer would increase the voltage instead, which is not suitable for this application.