A Broker is the person who paid a fee or commission for executing the buy or sell orders of a customer. In futures trading, the term may refer to one of several entities:

Floor broker - a person who actually executes the trade in the trading pit or electronically;

Account executive (AE), Associated Person (AP), or Registered Commodity representative (RCR) - the person who deals with customers in Futures Commission Merchant (FCM) offices;

FCM - a firm or person engaged in executing orders to buy or sell futures contracts for customers.