How to combine two columns in Excel using formulas, and keep all of their data

You can combine two columns in Excel using several formulas and tools available in the software. Here's how to combine two columns in Excel.
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This one Excel symbol will change how you write formulas

The best way to do this is by converting your data to an Excel table. Select your data range (A1:E11), press Ctrl + T, and click OK. Excel names it something like "Table1"; in my case, it's Table3, ...