A voltage regulator is an electronic device that maintains a constant output voltage level despite variations in input voltage or load conditions. It ensures that electrical devices receive a stable voltage, which is crucial for their proper operation. Voltage regulators are commonly used in power supplies, battery chargers, and various electronic circuits to protect sensitive components from voltage fluctuations. There are different types of voltage regulators, including linear and switching regulators. Linear regulators provide a steady output by dissipating excess voltage as heat, while switching regulators use a more efficient method by rapidly turning on and off to control the output voltage. Both types play a vital role in ensuring reliable performance in electronic systems.