So what happens if you're waitlisted?

<p>the title is pretty brief but, really what happens? When you are placed on this list, are the most qualified sitting at the top of this list to take the spot of another? Or if is just a random pool of applicants, and they draw whatever number out of this pool? And here's another: how often do people on the waitlist actually end up getting admitted to the school? If you do get admitted, whats the last "push" thats gets you in? If you can answer any one of the questions, that would help me alot!~</p>