A product catalog system is a platform that enables businesses to manage and store their product information in a centralized location. This includes product data, descriptions, images, pricing, and availability. A product catalog system can be either internal or external. An internal product catalog system is used by businesses to manage their product information internally. This is typically done through a product database or product information management (PIM) system. An external product catalog system is used by businesses to manage their product information externally. This is typically done through an online marketplace or an e-commerce platform.