The address of a cell (like B3) used in a formula to pull that cell's value.
Try it with AIA cell reference identifies a cell by its column letter and row number (B3). References can be relative (B3), absolute ($B$3), or mixed (B$3), and can span sheets (Sheet2!B3) or ranges (B3:B10).
A reference that spans the same cell across multiple sheets, e.g. =SUM(Jan:Dec!B2).
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