The eBay Catalog API is a tool that allows developers to access detailed information about products listed on the eBay platform. It provides a centralized database of product catalog data, such as product specifications, images, and identifiers, which can be used to enhance product listings and improve search results. By utilizing the eBay Catalog API, developers can streamline the process of listing products on eBay, ensure accurate and consistent product information, and enhance the overall shopping experience for eBay users. This API ultimately helps sellers and buyers connect more effectively on the platform by providing a comprehensive and reliable source of product information.