* Voltage (or electrical potential difference): This is the difference in electrical potential between two points. It's essentially the "push" that drives electrons through a circuit.

* Electromotive force (EMF): This is the energy provided by a source, like a battery, to move electric charges around a circuit.

It's important to note that while both are measured in volts, they represent different concepts:

* Voltage is the *result* of an electric field, a difference in potential energy between two points.

* EMF is the *source* of the electric field, the energy provided by a battery or other source to create that potential difference.

So, while technically both are measured in volts, they are distinct concepts in electrical theory.