I often hear from people who are thinking about sitting for the CBLE (Customs Broker License Exam) or those who are simply curious about the profession. Here is some info from the CBP website and 19 CFR 111.1

Customs broker. Customs brokers are private individuals, partnerships, associations or corporations licensed, regulated and empowered by U.S. Customs and Border Protection (CBP) to assist importers and exporters in meeting Federal requirements governing imports and exports. Brokers submit necessary information and appropriate payments to CBP on behalf of their clients and charge them a fee for this service.

Brokers must have expertise in the entry procedures, admissibility requirements, classification, valuation, and the rates of duty and applicable taxes and fees for imported merchandise.

There are approximately 14,454 active licensed Customs brokers in the United States.

Customs business. “Customs business” means those activities involving transactions with CBP concerning the entry and admissibility of merchandise, its classification and valuation, the payment of duties, taxes, or other charges assessed or collected by CBP on merchandise by reason of its importation, and the refund, rebate, or drawback of those duties, taxes, or other charges. “Customs business” also includes the preparation, and activities relating to the preparation, of documents in any format and the electronic transmission of documents and parts of documents intended to be filed with CBP in furtherance of any other customs business activity, whether or not signed or filed by the preparer. However, “customs business” does not include the mere electronic transmission of data received for transmission to CBP and does not include a corporate compliance activity.

Here is a link for more info about eligibility and the application process:

https://www.cbp.gov/trade/programs-administration/customs-brokers/becoming-customs-broker