You can categorize or group related values in a column into categories to make analysis easier.
You can view the source of the data for a selected column in a worksheet. You might want to view the source of the data in a column to help you troubleshoot an issue.
You can revert types or data domains inferred during sampling on columns to the source type. You might want to revert an inferred type or data domain to the source type if you want to use the column data in a formula.