The MKS unit of electric potential is the volt.
The same unit you see on light bulbs.
If a test charge q is placed where the electric potential is V, then its electrical potential energy is
Because the dependence on the test-charge has been divided out, the electric potential depends only on position.
It can be thought of as a property of space.
The difference between the potentials at two different points measures the work needed to move a unit charge between those points.
It is usually potential differences which are significant.