Definition of Board
The term board is a synonym for the poker table or the playing surface. It also has other meanings, all of which derive from that core definition.
In poker games that use community cards, such as Omaha and Texas Hold 'em, the term board refers to those shared cards: the flop, the turn and the river.

Players also use the phrase 'on the board,' such as there were no spades on the board. In other words, the player needed a spade, and none of the shared cards was a spade.
'Playing the board' refers to using all five community cards, and neither hole card, to make a hand. Playing the board tends to happen when the board has a straight, a full house, two pair with a high-ranked kicker and so forth.
It's unusual for more one than one player at a time to play the board. A situation where this does occur is a full house on the board, with neither player possessing a pocket pair or being able to make a pair using one hole card.
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