Photoshop tennis termonology

Ok. I know how to do battles and such… but could someone please define the proper terms used for me? I know a match is the whole battle in it’s entire self… but what is a volley, and a serve?

from what I understand, a serve is a collection of every contestants first image, and a volley is each individual image.

is a “round” the same thing as a volley, or a serve?

please help me out, as I’m creating a battle arena for myself and I want to get the labeling right.
i fell dumb asking, but hey i’m only about 1 month into battling.