A good analogy is water in a mill pond. In a pond water has gravitational potential energy because of how high it is above sea level. When the water goes over a fall it loses energy. There might be a pond in the hills with 100 liters of water and 1000 joules of energy in the pond, and so there are 10 joules of energy per liter. Another pond might have 100 liters of water but yet only 500 joules of energy because the pond is in a lower valley. This pond has 5 joules per liter. Similarly, we could have 100 coulombs of charge with 1000 joules of electric potential energy stored somewhere, maybe in an electric circuit. The electric potential would be 10 joules of energy per coulomb. In another place, maybe another place in the same electric circuit, there might be an electric potential of 5 joules per coulomb.