A resistor whose values can be varied over a range of values is called a variable resistor.
A resistor whose electric resistance value may be changed is referred to as a variable resistor. A variable resistor, which functions typically by gliding a contact (wiper) over a resistive element, is essentially an electro-mechanical transducer.
A potentiometer is what is utilized when a variable resistor with three terminals is used as a potential divider. It operates as a variable resistance and is known as a rheostat when just two terminals are present.
It is possible to regulate variable resistors electronically rather than mechanically thanks to the existence of such devices. Digital potentiometers are the name given to these resistors.
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