It is a position holder which allows you to distinguish between 405 and 45, for example.
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Use of zero.
The Indian sub-continent where the zero symbol came from
Mayan
Because the Hindu-Arabic numeral system contains a zero symbol thus facilitating the speed and ease of arithmetical calculations.
Because the Hindu-Arabic numeral system contained a zero symbol which made mathematical calculations a lot simpler than the Roman numeral system which didn't have a zero symbol.