On the Amazon shopping website, you can tell if it is a product sold by Amazon in the following ways:

1. "Shipped by Amazon" logo on the product page: On the product page, if the product is sold by Amazon and shipped by Amazon, there is usually an obvious logo, such as "Shipped by Amazon", "Amazon-operated", etc. This logo is usually located below the product title or next to the Add to Cart button.

2. Seller information: On the product page, you can check the seller information section, usually below the product title or in the footer. If the seller is Amazon, then the product is sold by Amazon. If the seller is another name, it may be a third-party seller, not Amazon-operated.

3. Select filter conditions: On the search results page or product list page, you can use the filter function to display only products sold by Amazon. In the filter conditions, you can select "Amazon-operated", "Amazon-shipped" and other options to display only products sold by Amazon.

These methods can help you understand whether a product is sold by Amazon so that you can make a purchase decision. But please note that for products from third-party sellers, Amazon still provides platform support and is responsible for handling refunds and after-sales services.