A voltage regulator is an electronic device that maintains a constant output voltage level, regardless of changes in input voltage or load conditions. It ensures that electrical devices receive a stable voltage, which is crucial for their proper operation and longevity. Voltage regulators are commonly used in power supplies, battery chargers, and various electronic circuits. There are different types of voltage regulators, including linear and switching regulators. Linear regulators provide a simple and efficient way to reduce voltage, while switching regulators are more complex but can be more efficient for larger voltage drops. Both types play a vital role in protecting sensitive components from voltage fluctuations.