Hosted catalogs in B2B mean the supplier runs the catalog on their infrastructure: buyers authenticate, see only what they are allowed to buy, and order against live pricing. That is different from uploading a CSV to a marketplace or emailing a quarterly PDF.
The trigger is usually control: competitors or job bidders should not browse your full line and pricing. Hosted catalogs combine authentication, assignment, and audit-friendly order history — the same requirements behind distributor catalogue management, delivered as a service rather than a file share.
A public Shopify or ecommerce site is self-hosted merchandising for unknown visitors. A hosted B2B catalog is invite-only, often with PO and Net terms instead of card checkout. If your buyers are already on account, the hosted catalog replaces repeat phone orders — not consumer discovery.
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