There are a variety of different commonly used fields, including
Metaphorically, a playing field refers to any place or context within which competitive activity takes place, most often economic competition between companies. A metaphorical playing field is said to be level if no external interference such as government regulations affects the ability of the players to compete fairly. See Free Trade.
The term is also used for collectable card games, where it refers to the area that the cards are placed during gameplay.