What type of resistor has a movable clamp that allows the user to select an exact resistance value?

The type of resistor that has a movable clamp to select an exact resistance value is called a potentiometer. It functions as a variable resistor by allowing the user to adjust the resistance by moving the wiper along the resistive element. This makes it useful for applications such as volume controls in audio equipment and tuning circuits. Potentiometers can be found in various forms, including rotary and linear types.