what is a pendulum card in yugioh INFO-AE092 Witch (N) Pendulum Monster | Yu-Gi-Oh Card

I'll try to be as thorough as I can but I'm assuming you already know a little about the effects

Golem Sentry X EARTH Level 4 [ Rock / Effect ] ATK 800 DEF 1800 Once per turn: You can change this card to face-down Defense Position

Foolish Revival forces you to special summon a Monster from the opponent's Graveyard to their side of the Field in Defense Position

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