Amazon can use reviews to more accurately understand the sales of products. Explanation: After purchasing and using products, Amazon registered users can leave comments at the bottom of the product page. These comments not only show the user's experience with the product, but also reflect the popularity of the product in the market. When a large number of users give positive reviews to a certain product, it means that the sales volume of the product may be high; conversely, if the number of reviews is small and most of them are negative reviews, the sales volume of the product may be low. In addition to judging sales volume only from the number of reviews and the rate of positive reviews, Amazon also provides sales rankings, sales data reports and other tools to help sellers understand product sales more accurately. At the same time, in order to prevent false reviews or using reviews to improve the ranking of its own products, Amazon will also review the reviews to ensure their authenticity and legality.