Why ATM Pins are four digits??

eslavathram(35)
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Operational since 1967, Automated Teller Machines (ATM) have been around for almost 50 years now and it is safe to say that they are one of the most convenient inventions ever!/storage/emulated/0/amigo/ScreenLock/Favorite/http___glance.l.inmobicdn.net_public_dynamic_720x1280_97ccb3c39e7458cc545a55bcdb7d4910c2fbc6a4.webp.png

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Why ATM Pins are four digits?? | Ecency