Junctioning allows you to 'Junction' the magic that your character has in his or hers inventory to produce noticable effects to your character's statistics. For example, if Squall's HP is at 2143 and you then junction 100 Fire spells to his HP statistic through the 'HP J' junction ability, his HP will increase by 100 to 2243. That example replaces Final Fantasy VII's 'HP Plus' Materia idea.

You can mess around with all sorts of statistics, such as luck and strength, but only when you have gained the appropiate junction ability first; you can't junction magic to your character's Strength statistic without having an equipped Guardian Force learnt the 'Strength Juntion' ability.

[ Magic junctioning Chart ]

Attribute Attack and Defense
You can attribute magic to your character's attack and defense through the junction System with the results depending on what magic you use. With your attribute attack, say if you wanted Squall to do more damage to fire-based creatures, you would junction fire magic to his attribute attack. If you want Squall to be better protected against fire attacks, you would attribute fire magic to his attribute defense.

The effectiveness of your 'attributing' is governed by two factors:

Power of the Magic - For example, Fire 3 will be much more effective than Fire 1.
Quantity of the Magic - For example, 30 Fire 3's junctioned will be much more effective than 10 Fire 3's.

[ Attribute junctioning Chart ]

Status Attack and Defense
Say if you wanted Rinoa to be protected against Poison attacks, you would simply junction Poison to her Status Defense. If you junctioned Poison to her Status Attack, she would inflict Poison everytime she attacked physically with her weapon.

[ Status junctioning Chart ]