Attributes, are essentially the "Elemental" groups for each Monster Card. There are different cards made to support each "element", and there are popular monsters of each kind. It is possible for a monster to be considered part of multiple attributes via a card effect, such as with cards like "Elemental Mistress Doriado", "Elemental Hero Electrum", "Light and Darkness Dragon", "Sphere of Chaos", and "Dark Simorgh".

      DARK Dark EARTH Earth FIRE Fire
      LIGHT Light WIND Wind WATER Water   

In Yu-Gi-Oh! The Sacred Cards, and Yu-Gi-Oh! Reshef of Destruction, there are four additional attributes, Thunder, Shadow, Dream, and Forest. DARK is also renamed to Fiend.