What is Four Flush in Poker?

Holding four cards to a flush with a chance to complete the flush on later streets. For example, if you hold 7♦ 6♦ and the flop comes K♦ 8♦ A♠, you have a four flush, also commonly known as a flush draw. 

Want to learn how to play on Four Flush boards? Read this article:

How to Play 4-Straight & 4-Flush Boards Like a Pro (3 Key Tips for Each)