Unmerging cells in Microsoft Excel is the process of separating previously combined cells back into individual cells. Merging cells combines two or more cells into a single larger cell, while unmerging reverses this process.
Unmerging cells can be useful when you want to edit the contents of individual cells that were previously merged. For example, if you have a column of merged cells containing customer names and addresses, and you need to update the address for a specific customer, you would need to unmerge the cells in order to edit the address field.