Straight flush
A straight flush is five consecutive cards all of the same suit, the best hand class there is.
There are 40 of them among the 2,598,960 five card hands, which is 0.0015%, and 4 of those 40 are the ace high version known as a royal flush.
The practical difficulty is that it is almost invisible to everybody else. A board that allows one usually looks dangerous enough that opponents slow down, so the hand is far easier to make than it is to get paid for.
an example
your cards
board
The nine, eight, seven, six and five of hearts run together in one suit. A player holding two other hearts has a flush and no idea they are drawing dead, which is the one situation where this hand does get paid.
This example is made up. The real one is in your own hand history: find straight flush in your own hands and see how often it came up and what it cost you.
related terms
Royal flush
A royal flush is ten through ace all of the same suit, the highest straight flush there is and therefore the best hand i ...
Flush
A flush is five cards of the same suit, which beats a straight and loses to a full house.
Four of a kind
Four of a kind is all four cards of one rank, a hand that beats everything except a straight flush.
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Knowing the word is not the same as seeing it.
Real spots where you say which hand wins, and it keeps score.