Postflop play refers to the play that takes place in a hand after the preflop betting around in Texas Hold’em. To be more precise, the flop, turn and river action in Texas Hold’em and any poker game that has community cards.
It is not just a case of saying you should raise these hands in certain positions, there is more factors to consider once the flop has been dealt. I think it is largely learned through experience, as you learn to deal with playing weaker hands, and knowing when it’s good to be aggressive, or time to slowdown your play.
EXAMPLE “Crushing poker is all about postflop play.”
The book Postflop: The Edge You Need in No Limit Hold’em by Ben “Gamb64″ Hayles is a must-read if you’re interested in improving your post flop game.