A Parallel Summon is the act of Special Summoning a Parallel Monster from the Extra Deck.
How to Parallel Summon[]
During their Main Phase, the turn player can Parallel Summon a Parallel Monster from their Extra Deck by placing face-up monsters they control on the bottom of their Deck as Parallel Materials. After that, the player Summons the Parallel Monster from the Extra Deck in an unoccupied Main Monster Zone that a Link Monster points to or an Extra Monster Zone in face-up Attack or Defense Position. A player can perform any number of Parallel Summons per turn.
