What Is a Potentiometer, and How to Choose the Correct Potentiometer?

It's a piece of hardware, that has a rotary motion that varies a resistance on the wiper of the device.

So where it usually used and for what reason?
I suspect the OP and Markus23 to be profile spam.
I dunno, that wiper of the device comment is clearly not a translation program failure or anything, they are probably the real deal :P
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