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To amplify a bit on the response from wumolad the technical term for this is "Absolute Reference." It's possible to anchor to a cell, a column, or a row. You accomplish this by using the dollar sign. In the absence of any dollar sign, you're using what's called "Relative Reference."

$A$1 anchors to the cell, regardless of where you copy the formula to.

$A1 anchors to the column

A$1 anchors to the row

Here's a more complete guide.

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