Protection is an ability in the card game "Magic: The Gathering" that grants immunity against specific sources. For example, a player with protection from red is immune to damage from red cards and cannot be targeted by red abilities or spells. Permanents, such as creatures, can be similarly protected.
Protected creatures attacking an opposing player cannot be blocked by creatures with the protected characteristic.
Protection has potential drawbacks depending on the cards used in a deck. A permanent with protection from a specific characteristic cannot use equipment with that characteristic.
The scope of protection can range from a narrow characteristic like "flying creatures" to protection from everything.