The abjuration school of magic encompassed protective spells. They created physical or magical barriers, negated magical or physical abilities, harmed trespassers, or even banished the subject of the spell to another plane of existence. The abjuration school had no subschools. A wizard who specialized in abjuration was known as an abjurer.
Some abjuration spells included dispel magic and resist energy.
Aid
Alarm
Antilife Shell
Antimagic Field
Arcane Lock
Banishment
Beacon of Hope
Counterspell
Death Ward
Dispel Evil and Good
Dispel Magic
Forbiddance
Freedom of Movement
Globe of Invulnerability
Glyph of Warding
Greater Restoration
Guards and Wards
Holy Aura
Imprisonment
Lesser Restoration
Mage Armor
Magic Circle
Mind Blank
Nondetection
Pass without Trace
Planar Binding
Prismatic Wall
Private Sanctum
Protection from Energy
Protection from Evil and Good
Protection from Poison
Remove Curse
Resistance
Sanctuary
Shield
Shield of Faith
Stoneskin
Symbol
Warding Bond