The QuickBooks Migration Tool is a tool used to move QuickBooks data from one computer to another or to upgrade to a newer version of QuickBooks. Here's how it works:

1. Download the tool from the Intuit website.
2. Run the tool on the computer where the QuickBooks data is currently stored.
3. Follow the on-screen instructions to select the QuickBooks data file you want to move, and specify the location to which you want to move it.
4. The tool will copy the QuickBooks data file and all associated files to the new location.
5. Open QuickBooks at the new location, and you should now have access to the transferred data.