Magic:School
This is the school to which the spell belongs. Schools of magic are groups of related spells that work in similar ways.
A wizard who chooses to specialize in a school of magic gains one additional prepared spell per level but loses the ability to cast spells from one other school. A wizard does not have to specialize, thus keeping access to all spells.
"Universal" refers to a spell that belongs to no school.
The Eight Schools of Magic: Abjuration, Conjuration, Divination, Enchantment, Evocation, Illusion, Necromancy, and Transmutation.