A voltmeter is an electrical instrument used to measure the voltage, or electric potential difference, between two points in an electrical circuit. It is typically connected in parallel with the component or section of the circuit being tested. The reading on the voltmeter indicates how much electrical energy is available to move charges through the circuit. Voltmeters can be analog or digital. Analog voltmeters use a needle and dial to display readings, while digital voltmeters provide a numerical readout. Both types are essential tools in electronics and electrical engineering, helping technicians and engineers ensure circuits operate correctly and safely.