Overview
A croupier or dealer is someone appointed at a gambling table to assist in the conduct of the game, especially in the distribution of bets and payouts. Croupiers are typically employed by casinos.
Origin of the word
Originally a "croupier" meant one who stood behind a gambler, with extra reserves of cash to back him up during a gambling session. The word derived from croupe (the rump of a horse) and was by way of analogy to one who rode behind on horseback. It later came to refer to one who was employed to collect the money from a gaming-table.
Originally a "dealer" meant one who was responsible for distributing cards or the player in the dealer position, regardless of whether or not that player was responsible for distributing the cards.
Training
From Wikipedia (CC BY-SA 4.0).