Why ATM having only 4 digits pin ???

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The ATM stick is 4-digits in length as it was the longest series of numbers the innovator's (John Shepherd-Barron)wife could recollect.

The worldwide standard for PIN administration and security in retail keeping money, takes into account PINs from four up to twelve digits, yet additionally takes note of that "For convenience reasons, a relegated numeric PIN ought not surpass six digits in length."Financial PINs are frequently four-digit numbers, with Switzerland being a prominent special case with six-digit PINs being given of course. Most ATM and POS programming does not bolster PINs longer than six digits, and numerous information gadgets can just acknowledge four digit PINs.