In variants of poker such as the Texas Hold’em and the Omaha Hold’em, the first three cards to be placed on the board are known as the flop. In some cases, the cards themselves are referred to as flops while in others, people refer to the action of flipping the first three cards as flop.
All three cards of the flop are placed face-up on the board and these cards are referred to as community cards, i.e. cards that are dealt for the benefit of all the players on the table. All three cards in the flop are dealt simultaneously as soon as the opening round of betting is concluded.
The flop is followed by another round of betting that is in turn followed by the fourth community card, known as the turn, to be placed on the table.
The flop cards are placed face down to begin with and after being placed on the table, they are flipped and placed in their spot on the board. Once the flop is dealt, the player is then exposed to 5 cards, or one full hand. At this point of the game, most of the players still in the game will have significant knowledge about the status of their hand as to how good or bad it is. Despite being a crucial juncture in a round, a flop has about three rounds of betting to come after it.