1. The international classification of trademark inquiry refers to grouping some goods with the same attributes into one category, which is a sign to distinguish the sources of goods or services, mainly for the needs of trademark retrieval, examination and management.

2. Each category has a category number and a title. The title of each category summarizes the characteristics and scope of the goods contained in that category. Finally, list all the goods or services included in this category, and each commodity or service has a serial number for easy searching.