Definition:
In Texas Hold'em, players can 'Play the board' or use all five of the face-up cards to make their hand.
For example, if a player has 2-3 as their hole cards and the five community or board cards are Ace-Ace-Ace-Ace-King, the best hand they (or anyone) could make is Ace-Ace-Ace-Ace-King, so the player would choose to use those five cards or play the board.
In Texas Hold'em, players can 'Play the board' or use all five of the face-up cards to make their hand.
For example, if a player has 2-3 as their hole cards and the five community or board cards are Ace-Ace-Ace-Ace-King, the best hand they (or anyone) could make is Ace-Ace-Ace-Ace-King, so the player would choose to use those five cards or play the board.