A split pot is a pot in which two or more players have hands of equal value, and, therefore, split the money in the pot. Texas Hold'em uses exposed communal cards in the center of the table which combined with the two hidden cards in each player's hand are used to form the best poker hand.

Let's look at this example:

If the up-cards are 2-3-8 jack and king, you have a king and an ace, with your opponent having the king and queen, do you win the pot with a pair of kings with an ace high?

You would have won the pot outright with your pair of kings, ace high. But, card suits also come into play, and this example failed to mention the suits of any of the cards.

Had the communal cards all been of the same suit, while your king/ace and your opponent's king/queen had been of a different suit, then the pot would be split since you both would share a flush, any five cards of the same suit, with the 2-3-8 jack and king.

Let's look at another example.

Let's say the five community cards are all hearts. For example, the board shows the 6, 7, 8, 10, and Jack. In my hand, I have the Ace of hearts. Do I get to play my Ace of hearts and take the pot, or am I screwed and the pot is split?

My pocket Ace of hearts ranks supreme and I can marry it with the just four of the other hearts on the board (the five face-up cards in Texas Hold'em).

My Ace-High Flush would be higher than any other flush whose highest card ranks lower than the ace. If ever the highest card in the flushes of two opponents is the same, the hand is counted down to the next highest card to see which flush is higher.

This countdown can continue until the final card of the hand determines the higher flush.

One exception (there's always one, n'est pas) to your specific example would be if someone were holding the nine of hearts as one of their two pocket cards. They trump your hand because that player would have cards in sequence, making their hand a Straight Flush.