What's the Use of an optional Resume?

Some schools on the common app allow an applicant to submit an optional resume if they choose to do so. However, the activities sheet of the common app is pretty much your resume. Is this optional resume just a place to put more awards or activities not present in the common app?

Only do it if you have a significant number of activities/awards/tests that do not fit in the common app’s space for those things. VERY few students should need an additional resume, and those who do should not exceed one side of one page. @collegefan909124