The type of formatting that is applied to cell A20 is called conditional formatting.
Conditional formatting in Excel Sheet enables an easier method of highlighting noteworthy cells or ranges of cells, displaying data by employing data bars, color scales, and icon sets that match particular variations in data.
A conditional format modifies the look of cells based on the conditions you set. The cell range will be formatted provided that the conditions are true; if otherwise, it will be false and the cell range will not form.
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