title: real-time-match or matchmaking in swift
body: <p>I'm working in a multiplayer game using swift and firebase .</p>
  
  <p>I'm trying to understand how <strong>matchmaking</strong> or <strong>real-time-match</strong> work.</p>
  
  <p>So I just want to know what methods should I be using ? And is there a difference between <strong>Game Center</strong>  and <strong>Firebase</strong> methods ?  </p>