What is the difference between using a single-click on the Format Painter and using a double-click?

What will be an ideal response?

Using the Clipboard group's Format Painter, you can quickly and easily copy all formatting from one area to another in Word, PowerPoint, and Excel. To copy a format, you must first select the text containing the desired format. If you want to copy the format to only one other selection, single-click Format Painter. If, however, you plan to copy the same format to multiple areas, double-click Format Painter. Select the area to which the copied format should be applied. If you single-clicked Format Painter to copy the format to one other selection, Format Painter turns off once the formatting has been applied. If you double-clicked Format Painter to copy the format to multiple locations, continue selecting text in various locations to apply the format. Then, to turn off Format Painter, click Format Painter again, or press Esc.