How is work related to the movement of a charge in an electrostatic field with the potentials of the starting

How is work related to the movement of a charge in an electrostatic field with the potentials of the starting and ending points of the trajectory?

The work of moving an electric charge between two points of the field is equal to the product of the charge and the potential difference of the starting and ending points:
A = q (f1-f2)

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