You may know most of these Jobs from other Final Fantasy games that use the JOB SYSTEM.
In the Zodiac Age each Character can eventually have two Jobs each, but at the beginning of the game you are stuck with only one. This means you basically have to lock each of your Characters into using certain kinds of WEAPONS, ARMORS, ABILITIES. Unlike the original Final Fantasy XII in which everyone had identical Licence Boards and anyone could eventually use any kind of WEAPON, ARMOR, MAGICKS, TECHNICKS, ETC, the Zodiac Age adds a level of depth to the game by using the JOB SYSTEM.
If your playing Final Fantasy XII: The Zodiac Age for the first time, even if you have already played the original Final Fantasy XII, you are probably new to this, “JOB SYSTEM.” In Final Fantasy XII: The Zodiac Age each Character has to pick one of 12 different Jobs (or Licence Boards) in order to progress in prowess.