Shield

Level & School
1st-level abjuration
Casting Time
Reaction, which you take when you are hit by an attack roll or targeted by the Magic Missile spell
Range
Self
Components
V, S
Duration
1 round
Classes
Sorcerer, Wizard

An imperceptible barrier of magical force protects you. Until the start of your next turn, you have a +5 bonus to AC, including against the triggering attack, and you take no damage from Magic Missile.

Shield 5.5e 2024 vs. 5e 2014 edition differences

There are no significant mechanical differences between the 2014 and 2024 versions of the Shield spell. Both provide a +5 AC bonus and immunity to Magic Missile damage for 1 round, with identical durations and effects.