Does the JQX-115F-Q power relay step down voltage?
A relay is essentially an electrically-operated switch.  Relays have two independent ratings: one for the coil or operating mechanism, and one for the switch contacts.

That relay is apparently intended to be operated by 9 V DC - the "9VDC" is in-line with a coil symbol.

The contacts are rated for up to 16 Amp at 250 VAC.

You would apply 9 VDC to the coil to cause the contacts to change position, and switch a 250VAC circuit.