To merge two columns in Excel, you can use the CONCATENATE function or the "&" operator. Here's how you can do it:

Using CONCATENATE Function:

1. Open your Excel spreadsheet containing the columns you want to merge.

2. Click on the cell where you want the merged data to appear.

3. Type the following formula:

```

=CONCATENATE(A1, " ", B1)

```

Replace "A1" and "B1" with the cell references of the columns you want to merge. You can adjust the formula to include additional columns if needed by adding more cell references separated by commas within the CONCATENATE function.

4. Press Enter. The contents of the specified cells will be merged into one cell.

Using "&" Operator:

1. Open your Excel spreadsheet.

2. Click on the cell where you want the merged data to appear.

3. Type the following formula:

```

=A1 & " " & B1

```

Replace "A1" and "B1" with the cell references of the columns you want to merge. You can adjust the formula to include additional columns if needed by adding more cell references separated by "&" within the formula.

4. Press Enter. The contents of the specified cells will be merged into one cell.

Note: After merging the columns using either method, you may want to copy the formula down to apply it to multiple rows if necessary. Simply click and drag the fill handle (the small square at the bottom-right corner of the selected cell) down to fill the formula into adjacent cells.