It creates a switchable, floating, power source that you connect directly between source and gate on the device you want to control.
As it is floating, the absolute source voltage does not matter.
The FET type makes no difference, as long as the polarity is correct for the gate relative to the source.
Most of the applications examples show them used to make simple solid-state relays, but there is no reason they cannot be used for any other gate drive application where the low switching speed does not matter.