Definition of dealer
The dealer is the person who deals the cards to the players at the table. To be precise, there are two types of dealer. There will be the real dealer who will deal the cards to the players and the dealer (dealer or button) who will be called virtual. In a casino poker game, the dealer will be the employee paid by the casino to shuffle the cards and deal them to the players at the table. He will also be the one who deals the flop, turn, river and moves the main prize pool to the winner on each hand. This "real" dealer will not play with the other players, he will be the casino's employee.
The virtual dealer or button
Unless you are in a friendly game, the player in the button position will not deal the cards to the other players. His term dealer will be symbolic. The dealer position in poker is the best possible position. It is the player just before the blinds who will have the privilege of speaking last on all post-flop streets (flop, turn and river). You can recognize the dealer by the "dealer" sign in front of him. Some people also refer to the brewer.