A DC-DC converter is an electronic device that changes direct current (DC) voltage levels from one value to another. It is commonly used in various applications, such as powering electronic devices, electric vehicles, and renewable energy systems. By adjusting the voltage, these converters help optimize energy efficiency and ensure that devices receive the appropriate power levels. There are different types of DC-DC converters, including buck converters, which step down voltage, and boost converters, which step up voltage. These converters play a crucial role in modern electronics, enabling devices to operate effectively while managing power consumption and extending battery life.