In the auction, if the final bid is made in a suit, that becomes the trump suit.
A trick can be won either by the highest card in that suit, or by a trump. You must follow suit if you can, so you can only play a trump if you have no cards left in the suit which was led.
Not every hand has a trump suit. Hands played without a trump suit are said to be played in ‘notrumps’.
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