The Service Catalog is the user-facing portal where an organization lists the services, goods, and products it provides to its users for request.

The Product Catalog is a backend repository for asset management, containing the specific models (e.g., "Dell Latitude 5440," "Apple iPhone 15") that define the items.

The Vendor Catalog contains items offered by external, third-party suppliers, including their specific part numbers and pricing, which is used for procurement.

ServiceNow Official Documentation. (2024). Product Catalog. "The product catalog is a set of information about models. Models are specific versions or configurations of an asset." (Relates Product Catalog to models).

ServiceNow Official Documentation. (2024). Service Catalog. "Give people access to any business service they need through a single, easy-to-use portal... Let employees and customers request catalog items such as service and product offerings on their own." (Relates Service Catalog to what the organization provides).

ServiceNow Official Documentation. (2024). Manage vendor catalog items. "Create vendor catalog items to identify the products that a specific vendor supplies... Vendor items associate products in the Product Catalog with a vendor." (Relates Vendor Catalog to third-party suppliers).