Many seniors might be interviewing with your prospective colleges this fall. How to arrange an interview, who will interview you, and how the interview will be used, will all vary as per the school in question. Check the websites of your prospective colleges and attend information sessions to find out those details. Regardless, for those institutions that require or recommend interviews, this represents a great opportunity for you to communicate both demonstrated interest and fit to the colleges to which you'll apply, along with the chance for you to learn more about the institution.
This link from Smith College includes some basic but helpful tips for the college interview process which should still prove helpful, as do the links below. If you'll be interviewing this fall, check them out.
https://www.youtube.com/watch?v=xp5av-bwAHI&t$s (this is MIT specific; ignore the dates cited, it's from 2017, but the overall info remains great)
ROAM offers a recording of their essay workshop on their website:
