As the some other game,in the game of ffxi ,there are have many different types of jobs and races,the follow i will tell some of my know .hope it can help you to know ffxi game better.thank you  ^^

  In ffxi there are have five careers and fifteen races:

 Five careens are :HUM  ELV  TARU  GAL   MIT 

Primary six jobs are : Warrior  Monk  White Mage   Blcak Mage    Red Mage   Thief

Advanced  nine jobs are : Paladin    Beastmaster   Bard   Dark Knight    Ranger   Samurai   Ninja   Dragoon   Summoner

 FF11 professional system-wide open, the five races in 15 career change jobs freely arbitrary, but each has an independent career and experience the value of Level. In other words, all players at the initial stage of the starting point, apart from different racial, the other exactly the same.
When switching to the original level of occupational identity and completely disappeared, only the retention of some skills proficiency (Example: Red Mage and White Magic can be used to restore magic, red magic transfer into white magic, the magic of the skills to restore the same, but White Magic Can not exceed the level of proficiency in the ceiling, the excess part of the time being as the hidden value of rounding, the upgrade will be reflected).
FF11 has a vice-vocational system, when one of 15 occupations were selected a master level, you can in the remaining 14 occupations in the arbitrary selection of a career as a deputy, Vice-career can be transferred freely. However, Deputy career level should not exceed half of the main level, more than half the time being rounded down to the nearest part of, as the hidden value will be reflected after the upgrade.
FF11 vice vocational system can give greater occupational activity, although with a professional, if the deputy is different from the role on the battlefield may be a lot of changes happen, in theory, can produce 15 * 14,210 occupations. Allows gamers to freely transfer more choice, more tasks can be adapted to the environment.