Interrupt

From MTG Salvation Wiki

Interrupt is an obsolete card type. It has not been supported by the game since Sixth Edition.

Under the original rules, an interrupt was a spell that would resolve before the rest of the Batch. Some examples of interrupts include Counterspell, Red Elemental Blast and Dark Ritual. All Interrupt cards have received errata to make them instants, and all references to Interrupts have been given errata to reference instants.

From the Comprehensive Rules: Interrupt (Obsolete) Some older cards were printed with the card type “interrupt.” All interrupt cards are now instant cards. All abilities that were played as interrupts are now played like normal activated abilities (and are mana abilities if they produce mana).

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Card types
Groups	Supertypes	Card types	Subtypes
Spell (non-permanent)		Instant	Trap	Arcane
		Sorcery
Permanent	Basic, Legendary, Snow, World	Artifact	Equipment, Fortification, Contraption
		Creature	(...)
		Enchantment	Aura, Shrine
		Land	(...)
		Planeswalker	(...)
Miscellaneous		Tribal	(...)
		Plane	(...)
		Vanguard
Obsolete	Mono, Poly, Continuous	Interrupt, Mana Source