In Final Fantasy Tactics, there are over 20 jobs and over 400 abilities!
 

Below is a list of jobs and what it does. (I just guessed some of them, they might not be correct. If they're wrong, E-mail me!)
 

JOB (some of them) What it does?
Dragon Knight (Dragoon??) Have the special ability to use "JUMP"
Summoner Summon "Summon beast"
Talker (??) Read out a formula and use it.
Knight Can use special kinds of sword attack.
Thief Can steal.
Ninja Can throw things.
Archer Shoot arrows
White Mage Able to cast white magic.
Black Mage Able to cast black magic.
Yin Yang magic user Uses dark/light magic, such as absorbing HP
Chemist (Item User) Uses items
Mathmatician ???
Samurai uses sword attack (I think)
Singer Able to sing. Helps people...?
Monk Have to most HP, attacking and white magic abilities.
Elementalist Uses attacks like quake....
Mimic Copy other's moves.

 


Requirements for Jobs ^_^ (I just guessed some of them, they might not be correct. If they're wrong, E-mail me!)

Job name Job Requirements
Warrior (squire) Nothing special needed
Chemist  (Item User) Nothing special needed
Knight Warrior Lv.2
Archer Warrior Lv.2
Black Mage Chemist Lv.2
White Mage Chemist Lv.2
Monk Knight Lv3
Time Mage Black Magic Lv.3
Yin Yang Magic User White Mage Lv.3
Summoner Time Mage Lv.3
Talker yin-yang mage lvl.3
Elementalist Monk Lv.4
Thief Archer Lv.3
Dragon Knight Thief Lv.4
Ninja Archer Lv.4, thief Lv.5, Land Magician Lv.2
Singer (female only) Talker Lv.5, Summoner Lv.5
Bard  (male only) Talker Lv.5, Summoner Lv.5
Samurai Knight lvl. 4, monk lvl. 5, dragon knight lvl. 2
Mathmatician white mage lvl.5, black mage lvl. 5, time mage lvl. 4, yin-yang mage lvl 4.
Mimic Warrior Lv.8, Chemist Lv.8, Summoner Lv.5, Talker Lv.5, Elementalist Lv.5, Dragon Knight Lv5