Voltage, also known as electric potential difference, electric pressure, or electric tension, is the difference in electric potential between two points. It is defined as the work needed per unit of charge to move a test charge between the two points.

In simpler terms, voltage is the "push" that causes electric charges to flow in a circuit. The higher the voltage, the stronger the "push," and the more current will flow (assuming the resistance stays constant).

Key aspects of voltage include:

• Unit: The SI unit for voltage is the volt (V).
• Measurement: Voltage is measured using a voltmeter, which is connected in parallel between the two points where the voltage is to be determined.
• Analogy: Voltage is often compared to water pressure in a pipe. The higher the pressure, the more water flows. Similarly, the higher the voltage, the more electric current flows.