The best possible hand in Texas hold'em is the combination of ten, jack, queen, king, ace, all of the same suit.
Five cards of the same suit in sequential order.
Any four numerically matching cards.
Combination of three of a kind and a pair in the same hand.
Five cards of the same suit, in any order.
Five cards of any suit, in sequential order.
Any three numerically matching cards.
Two different pairs in the same hand.
Any two numerically matching cards.
Any hand that does not qualify under a category listed above.