By providing industry-standard product identifiers for your listings, you help to improve the quality of the Amazon catalog as a whole. Promoting confidence in the range of products depicted in the Amazon catalog helps to ensure a high-quality experience for customers.
For most categories, you are required to use a product identifier to create new product pages and listings. The specific GTIN (Global Trade Item Number) required for product page creation and matching varies by category, although UPCs are most commonly used. The requirements of each category, including exceptions and exemptions where available, are summarized in the table on the Overview of Category Requirements for Product IDs page.