As you apply to graduate school remember that you can always benefit from taking the admissions committee's perspective with regard to what they look for in applicants, essays, and recommendation letters. Graduate admissions committees and departments vary in their views of the importance of graduate admissions interviews. As noted by the Chronicle of Higher Education, some departments view interviews as a determining factor and others don't conduct them. Some conduct interviews by Skype, phone, or in person. Yet some judge applicants only on paper. The use of admissions interviews varies by discipline and department and by whether the committee considers interpersonal and communication skills in choosing applicants.
Also see: All About the Admissions Interview