Forbidden cards are essentially “banned” cards, while limited simply means that you can only put 1 in a deck, semi-limited is up to two in your deck only. Some cards in the OCG/TCG are either forbidden, or limited, and this is due to their ability to create an unbalanced experien...
YuGiOh Master Duel forbidden cards might limit your deck-building potential, but they won't stay banned forever.