Potential is with respect to what

When we say a body has "high" electric potential and "low" electric potential, to what potential is it with respect to?

• Depends upon where have you read it ...I think – Utkarsh futous Apr 4 '17 at 15:25
• For electric field, potential at a point is defined as work done in bringing a unit positive charge from infinite distance to that point. – Wrichik Basu Apr 4 '17 at 16:17

The electrical potential difference has a very simple physical meaning because it is just an energy that is the work done to move a unit charge. For example in your previous question you asked about the potential of an isolated sphere. To calulate this we simple take a test charge $q$ and calculate the work done to move this charge from infinity to the surface of the sphere. Then we divide this work by the charge $q$ and the result is the potential i.e. the work per unit charge.
Alternatively, and again going back to your previous question, the potential difference between the two plates of a capacitor is just the work done in moving our test charge $q$ from one plate to the other divided by $q$.