A Variable Resistor, commonly known as a Potentiometer, is an adjustable resistor whose resistance value changes by rotating its shaft (knob). It functions as a voltage divider and is widely used for adjusting reference voltage, controlling brightness, volume, or motor speed in electronic circuits.

Potentiometers typically have three terminals:

One terminal connected to Voltage (Vcc)

One to Ground (GND)

And the middle terminal (wiper) provides an adjustable output voltage depending on the rotation angle of the knob.