Quick Effects (previously known as Multi-Trigger effects) can be activated either during your turn, or your opponent's turn. They are the only Monster Effects that are Spell Speed 2.
Monsters that have quick effects usually have: "This effect can be activated during either player's turn", or something similar in its card text. Also, there are some exceptions of monsters with quick effects which don't read such effect in their lore (like "Horus the Black Flame Dragon LV8").
Some Quick Effects can be activated more than once in a chain, while others cannot.
see List of Quick Effect Monster Cards
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