Digital potentiometer is an electrical component with three terminals that serves as a variable resistor. By connecting a control voltage to a digital potentiometer's control terminal, the resistance of the device can be changed. The resistance element of the digital potentiometer controls its range of resistance, which ranges from zero ohms to its maximum value. The resistance value of the digital potentiometer can be adjusted in steps as small as one ohm. Digital potentiometer is applicable for gaining control, Wheatstone bridges, and brightness and contrast control of monitors.