Amazon's kitchen category is the largest category, among which the first-level category is the largest category, including pet supplies, shoes and handbags, home and kitchen, etc.;

The second-level category is a sub-category of the first-level category, including dog mats, sports shoes and wallets, etc.; the third-level category is a sub-category of the second-level category, including pet supplies cleaners, running shoes and women's wallets, etc.