The best hands in poker, ranked from highest to lowest, are:

1. Royal Flush: A, K, Q, J, 10, all of the same suit.
2. Straight Flush: Five consecutive cards of the same suit (e.g., 9, 8, 7, 6, 5 of hearts).
3. Four of a Kind: Four cards of the same rank (e.g., four Kings).
4. Full House: Three cards of one rank and two cards of another rank (e.g., three Aces and two Kings).
5. Flush: Five cards of the same suit, not in consecutive order.
6. Straight: Five consecutive cards of different suits (e.g., 10, 9, 8, 7, 6).
7. Three of a Kind: Three cards of the same rank (e.g., three Queens).
8. Two Pair: Two cards of one rank and two cards of another rank (e.g., two Jacks and two 7s).
9. One Pair: Two cards of the same rank (e.g., two 9s).
10. High Card: If no player has any of the above hands, the highest card in their hand determines the winner.

The ranking of hands is important in various poker games to determine the winner of a hand.