Explain to me how QR codes work

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I understand the code itself is a different make up of black/white grids to get your phone to recognize a linked site. But at some point won’t we completely run out of possible image combinations making them obsolete or is it something that regenerates a new site to QR connection? (On mushrooms so I might not have asked this very well lmao)

Basically will we run out of QR codes and if not how is there an endless supply?

In: Technology