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In page Blackjack:

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The dealer deals from their left ("first base") to their far right ("third base"). Each box gets an initial hand of two cards. The dealer's hand gets its first card face-up. In "hole card" games, the dealer also gets a second card face-down (the hole card), and if the first card is a 10-A, the dealer will peek at the hole card to see whether they have a blackjack. If they do, they reveal it immediately, the hand ends, and the dealer takes all wagers whose hands are not also a blackjack. Hole card games are sometimes played on tables with a small mirror or electronic sensor used to peek securely at the hole card.[3][4] In European casinos, "no hole card" games are prevalent; the dealer's second card is not drawn until all the players have played their hands.[citation needed]