Volts are used to measure the push, or pressure, of electrons moving through a conductor. This flow is called electricity.
Voltage, the amount of volts intended for, or present in a circuit,
is determined by the difference of electrons in the masses at each end of the conductor.
The higher the difference, the more push that can be provided.
NOTE: If the voltage is high, that only means that the current can be pushed highly.
It does not mean that the current will move fast.
If voltage is high, but the amperage is low, then the current can move quickly, but instead moves slowly.