The rake is an amount of money taken by the house from all players as a payment to play at the table. This rule applies regardless of whether real money is used, to make the game more realistic. Howerever, if there is no flop, or if fourth street in stud games is not reached, no rake will be taken from the pot (no flop no drop policy).

Below you will find the PokerRoom rake structure. The structure is based on stake level and the max rake is based on the number of players.

Lower than $0.50-1.00:	$0.01 per $0.20 (Maximum rake: $0.50)
$0.50-1.00 to $2.00-$4.00:	$0.05 per $1.00
Higher than $2.00-$4.00:	$0.25 per $5.00

$0.25/$0.50 or lower	$0.05 per $1.00 (Maximum rake: $1.50, 3+ players)
Higher than $0.25/$0.50	$0.05 per $1.00

Maximum rake rules applies for all game types are (if nothing else is stated):

2 players	$1.00
3-4 players	$2.00
5+ players	$3.00

Note: No rake is drawn if there is no flop ("no flop no drop").