Euchre is played with a special 24-card deck. The deck consists of the following cards from each of the four suits (hearts, diamonds, clubs, and spades):

Aces 
Kings
Queens
Jacks
10s 
9s

These are the only cards used in Euchre, meaning that all cards ranked 2 through 8 are removed from a standard 52-card deck before play begins. This smaller deck size contributes to the fast-paced nature of the game, making every card dealt crucial to the strategy.