A Player 'sits out' when he chooses to leave the table for a short period of time. Note: If a Player sits out for more than fifteen minutes, or has missed two rounds of blinds, they are removed from the table.
When a player decides to sit out of the action for a few hands. Typically, a player can sit out for fifteen minutes or two rounds before they are removed from the table.
A player leaving the table or being timed out is "Sitting Out". In a live game, if a player sits out, there is a time limit for a player to remain out at which time he will be removed from the game