Why rankings matter

In Texas Hold'em you combine two private cards with five shared board cards and keep the strongest five-card combination. Knowing the ladder prevents confusing a flush with a straight or misreading kickers at showdown.

Strongest to weakest

RankWhat it looks like
Royal flushAce-high straight flush (A-K-Q-J-10 same suit)
Straight flushFive suited cards in sequence
Four of a kindFour cards of one rank
Full houseThree of a kind plus a separate pair
FlushFive cards of one suit, not in sequence
StraightFive ranks in a row, mixed suits
Three of a kindThree cards of one rank
Two pairTwo different pairs
One pairTwo cards of one rank
High cardNothing paired; highest card decides