'Pre flop' is not synonymous with online poker - it refers to community card poker games in general. The flop refers to the first 3 cards dealt to the board in games such as Hold'em and Omaha. As there is betting before the flop is dealt, anything that happens before this first three cards are dealt is referred to as 'pre flop'.
The play pre flop is largely based on a players hole cards, their position, stack size and information they have picked up from their opponents. The decision to play a hand based on these factors is made before any community cards are dealt.
Once the flop is dealt, all play is said to be 'post flop'.
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