Media Scratchpad - What is the difference between actual and projected Sales?

The Media Scratchpad features an 'Incomplete Sales' filter which allows you to toggle between 'Actual' and 'Projected'.

'Projected' sales compensate for incomplete sales attribution windows. If you wish to see what attributed sales may look like when viewing a period of time still within an attribution window, change the selection on the “Attributed Sales” box to “Projected” instead of “Actual”