Difference between “Zero” & “Null”

"Zero" is a value. It is the unique, known quantity of zero, which is meaningful in arithmetic and other math.

"Null" is a non-value. It is a "placeholder" for a data value that is not known or not specified. It is only meaningful in this context; mathematical operations cannot be performed on null (the result of any such operation is undefined, and therefore also generally represented as null).

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