Pallet refers to a tool used by the dealers in a game of baccarat. The tool is almost always made of wood, and it consists of a handle and a thin surface that is long enough for baccarat dealers to reach the cards across the table.
In other casino games, tables are generally a lot smaller, so if a dealer is centered at the table on the opposing side of the players, they can easily reach the other side and pick up any cards left by players.
Since baccarat tables are generally a lot bigger, the pallet is necessary. Thanks to it, the dealers can keep the game going, and distribute, move, or collect cards across the table without having to leave their position at the table.