On the Amazon platform, the following marks can be used to distinguish between self-operated and direct-operated products:

1. **Direct-operated products**: usually refer to products operated and sold by Amazon itself. The pages of these products will clearly mark "Ships from and sold by Amazon.com" or "Fulfilled by Amazon". This means that Amazon owns the ownership of these products and is responsible for inventory management, order processing, delivery and after-sales service.

2. **Self-operated products**: refer to products sold by third-party sellers through the Amazon platform. On the product page, it will usually be displayed as "Sold by [seller name]" and may be followed by "Fulfilled by Amazon" to indicate that Amazon provides logistics services, or "Fulfillment by [seller name]" to indicate that the seller is responsible for logistics. In this model, the seller is responsible for the procurement, inventory management, and delivery of the goods, while Amazon provides the platform and related services, such as order processing and payment settlement.

In summary, the key points to distinguish between Amazon's self-operated and direct-sale products are:

- **Direct-sale products**: Amazon owns the products and is responsible for the entire sales and delivery process.

- **Self-operated products**: Third-party sellers own the products and are responsible for sales, while Amazon provides the platform and some services.

In addition, direct-sale products usually provide a unified Amazon customer service experience, while the quality of after-sales service for self-operated products may vary from seller to seller. When purchasing, consumers can choose suitable products based on their needs and expectations for service.