Customs clearance refers to the customs formalities that must be handled when import and export goods and transshipment goods enter or leave a country's customs territory or border. Goods can only be released after customs declaration, inspection, tax payment and release, which is called customs clearance.
Similarly, all kinds of means of transport carrying import and export goods also need to declare to the customs, go through customs formalities and obtain customs clearance permits. In the process of customs clearance, goods, whether imported, exported or transshipped, are under customs supervision and are not allowed to circulate freely.