What does it mean when a Yu-Gi-Oh card is all holographic?

When a Yu-Gi-Oh card is all holographic, it means that the entire card is covered in a holographic foil. This type of card is typically a more rare and valuable version of the card, and is often sought after by collectors. All-holographic cards are often released as part of special sets or editions of the game, and can feature different artwork or designs than the regular versions of the cards.