<p>What are they?</p>
<p>The common app is a generic application that you fill out for all the schools. There is one long essay and a short answer. It also asks you for you gpa, ECs, SATs, etc. Each college is allowed to create their own supplement, which is an addition to the common app. It may include a few extra essays and a common essay topic is why did you choose xyz school. Some schools don’t even have supplements and others have very short ones.</p>