Real Estate Agents have to be licensed under a Real Estate Broker. You can also get a Broker's license and own your own Real Estate Agency and have Agents working under you. Agents get a commission ($$) and the Broker gets a percentage of that commission...so the more Agents you have under your license, the more commission you get. Brokers and also be their own agent and assist clients in buying/selling property. Brokerage offices such as Century 21 have multiple Brokers and agents, but there are small Real Estate Agencies that have a Broker and several Agents, or even just Brokers that work as individuals with no agents under them. In short, if you want to be a Real Estate Agent, you are working 'under' a Broker, or you can be a Broker and be your own boss!