There are two major ways to merge multiple sheets (tabs) in one or more Excel files: Joining rows horizontally (side-by-side) and Stacking columns vertically (one on top of the other).
For example, joining is where we want to take these two sheets:

And merge the rows side-by-side using a common (‘key’) column to get:

Find out the easy way to join Excel sheets.
For example, stacking is where we want to take these two sheets:



And merge matching columns one on top of the other (vertically) to get:

Find out how to stack Excel sheets into one sheet.
Questions or problems?