Explain the terms potential and potential difference. Give their $SI$ units.

(N/A) Potential: The electric potential at a point in an electric field is defined as the amount of work done in moving a unit positive charge from infinity to that point.
Potential difference: The potential difference between two points in an electric circuit is defined as the amount of work done in moving a unit positive charge from one point to the other.
The $SI$ unit for both electric potential and potential difference is the volt $(V)$.