As a marketplace operator, Magento also lets you view the product offerings of third-party sellers. Here, you can view the product SKU, title, price, number in stock, and the seller. You can also see whether the product is active on the website or not.
You can also add information about the seller in your webshop, so customers know they are dealing with an external seller. You can do this, for example, by adding a text next to the product (for example: Product is sold by "NAME SELLER"). Furthermore, it is possible that the external seller offers a different delivery cost/delivery period than the customers are used to from the web shop, so make sure this is clearly stated on the product detail page, the shopping cart or in the checkout.