If more than one player is still in the hand after all of the rounds of betting have been completed, the hand goes to a showdown - where the remaining player showing the best hand will win the pot. While all remaining players can show their cards, in many cases players with losing hands will choose to simply toss their cards away without revealing them if they see that a stronger hand has already been shown.
This video covers the rules regarding which player needs to show their cards first - as most players prefer to never show their cards unless they have to.
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