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Magento uses the term "catalog" to refer to the products in the database. Access to the catalog data is determined by several factors, including the scope setting, the catalog configuration, and the root category that is assigned to the store. The catalog includes products that are enabled and available for sale, as well as those that are currently not offered for sale.
From the AdminThe password-protected back office of your store where orders, catalog, content, and configurations are managed., all products in the database are accessible through the Catalog grid. If your Magento installation has multiple websites, each website can offer a different selection of products for sale from the same database.
In sales, the term "catalog" has a more narrow definition, and usually refers to a specific selection of products that is available for sale. For example, a store might have a "Spring Catalog" and a "Fall Catalog".
Like the table of contents of a printed catalog, the main menu of your store — or "top navigationThe primary group of web page links that a customer uses to navigate around the website; the navigation links to the most important categories or pages on an online store." — organizes products by categoryA set of products that share particular characteristics or attributes. to make it easy for customers to find what they want. The main menu is based on a "root category," which is a container for the menu that is assigned to the store. Because the specific menu options are defined at the store view level, each view can have a different main menu based on the same root category. Within each menu, you can offer a curated selection of products that is suitable for the store.