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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How Can I Merge Two Columns of Data Using Microsoft Excel and Eliminate Duplicate Values?

There are two situations in which you might need to merge two columns of data in Excel 2013. If you've imported two columns of data from separate sources, you might want to combine them into a single ...