Poker Hand Rankings
Each player has 2 hole cards and 5 community cards to use to created the best 5 card hand. A players hand can use from 3 to all 5 of the community cards (playing the board). All suits are ranked equally; therefore, if 4 9's were on the board (community cards) and one player has an Ace of spades and another player has an Ace of clubs, the pot is split. In Texas Hold'em the only time suit makes a difference is when drawing for the dealer position.
Best to Worst
Royal Flush

Straight from ten to Ace with all 5 cards of the same suit. All suits are ranked equally.
Straight Flush

Straight with all 5 cards of the same suit.
Four of a Kind

4 cards of the same rank. If 2 players share the same Four of a Kind, the bigger 5th card wins the pot.
Full House

3 cards of the same rank together with any 2 cards of the same rank. On
the example you can see "Aces full of Kings" and it's bigger full house
than "Kings full of Aces."
Flush

5 cards of the same suit (not consecutive). The highest card of the 5
determines the rank of the flush. The example is Ace-high flush.
Straight

5 consecutive cards of different suits. Aces can count as either a high or a low card. The example is five-high straight.
Three of a Kind

3 cards of the same rank. The example iss three-of-a-kind Aces, with King and Queen as side cards.
Two Pair

2 cards of the same rank together with another 2 cards of the same rank. The example is two-pair Aces and Kings.
One Pair

2 cards of the same rank. The example is pair of Aces.
High Card

Any other option not listed in the above hands.