What do patent claims 1 and 2 mean?

Independent claims and dependent claims. Patent claim is an application document that must be submitted to apply for invention patent and utility model patent. At the beginning of the claim, there shall be no content consistent with the name, serial number 1, 2 and 3 of the application for a patent for invention or utility model ... and it shall be directly used as an order. The total serial number 1 should be an independent claim, and the subordinate claims should be followed by serial numbers 2 and 3. The independent claim includes a preamble part and a characteristic part.