A customs broker is an enterprise that specializes in customs declaration services for import and export commodities. Customs brokers play a very important role in international trade, they provide enterprises with a series of professional services such as customs declaration, tax services, customs supervision, freight logistics and so on. Specifically, the main responsibilities of customs brokers include the following aspects:

1. Agent customs declaration service: The customs broker is responsible for completing the customs declaration procedures at the customs declaration window, including filling out the customs declaration form, paying taxes, obtaining documents, etc.

2. Tax services: Customs brokers can provide tax consulting, declaration and tax payment services for enterprises.

3. Customs supervision: The customs broker can assist the customs staff in the inspection and release of goods.

4. Freight logistics: Customs brokers can provide enterprises with freight forwarding, warehousing, loading and unloading and a series of logistics services.

In general, customs brokers play the role of a bridge and a link in international trade, providing a full range of services for enterprises to ensure the smooth progress of cargo customs clearance.