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what is arduino adc reference?

I'm using arduino for the first time and don't really understand what am I suppose to plug to the ADC refernce PIN... or if I even have to use it while plugging analog sensor to the arduino, thanks!

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  • "do not connect anything to AREF" and "[call analogReference(EXTERNAL)] before doing an analogRead" (amphasis mine). These are very important points not mentioned in the other answers. Commented Dec 15, 2017 at 8:52
  • I added the emphasis in my answer in case it was too mild as it was. ;) Commented Dec 15, 2017 at 10:36

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