The Playing Field is the area where Duelists place their cards. Gamemats (or Playmats) and Duel Disks are often used as Playing Fields. Each player has their own Playing Field with 5 Monster Card Zones, 5 Spell/Trap Card Zones, a Graveyard, and spaces for the Main Deck, Extra Deck, and a Field Spell Card.
The "field" referenced by card effects is the combination of each player's Monster Card Zones, Spell & Trap Card Zones and Field Card Zone. Thus, the field is shared and each player controls only one side of it, despite the common and incorrect habit by players of saying "your field" or "my field".
