In the EU market, the "CE" mark is a mandatory certification mark. Whether the product is produced by an enterprise within the EU or a product produced in other countries, if it wants to circulate freely in the EU market, it must be affixed with the "CE" mark to indicate that the product complies with the basic requirements of the EU's "New Approach to Technical Harmonization and Standardization" directive. This is a mandatory requirement for products imposed by EU law.