Fulfillment associate

I just applied to be a fulfillment associate and have an interview in two days. Now to be completely honest I have no idea what that job consists of lol. Im just looking for any job and applying at whatever place. So can anyone let me know what they do? I assume it’s gathering items in the store for big orders. Do I need decent strength for this job? I’m nervous for my interview and want to be 100% sure what I am interviewing for. Thanks:)