It is a token that is usually larger than regular tokens and normally indicates the person in charge of distributing the cards. It rotates clockwise between each hand. It is also possible to use a third-party object to symbolize this role. It’s essential.
It is the most advantageous position on a table since it is the last person to speak after the different streets (flop, turn and river). It can thus gather as much information as possible before making its decision.