What is the difference between voltage and potential difference?

Both are measured in volts (V). In most practical circuits, PD indicates the work done to move a unit charge, while voltage is the general term describing energy per charge.

For more details: Physics Classroom - Voltage & Potential Difference.

Voltage and potential difference (PD) are often used interchangeably, but technically: - Voltage is the energy per unit charge, measured between two points. - Potential difference is the actual difference in electric potential between those points.