1. The three major factors that influence Amazon's advertising are: its own massive product information, personalized recommendation algorithm and the advantages of the advertising platform itself.

2. Regarding the first factor, as the world's largest e-commerce platform, Amazon has a wide range of products, especially for some popular products such as books and home appliances, the massive product information can attract a large amount of user traffic.

3. Regarding the second factor, Amazon's personalized recommendation algorithm can accurately recommend products to users based on the user's search history and purchase behavior, thereby increasing the user's purchase probability.

4. Finally, Amazon's own advertising platform advantage can provide accurate advertising positioning and delivery, bringing advertisers higher advertising conversion rates and revenue. In summary, Amazon's massive product information, personalized recommendation algorithm and the advantages of the advertising platform are the three key factors that affect advertising effectiveness.

User behavior, product information and advertising bidding. First of all, user behavior is one of the key factors affecting advertising delivery. Amazon analyzes users' search, browsing and purchase behaviors to judge users' interests and needs, thereby accurately delivering advertisements. Secondly, product information is also an important factor affecting advertising. Amazon determines the sales potential and suitable advertising format of products by analyzing information such as product classification, labeling and description. Finally, advertising bidding is one of the decisive factors affecting advertising. The price of Amazon advertising is determined by the advertiser's bidding. Advertisers with high bids can get more exposure and click-through rates. In summary, user behavior, product information and advertising bidding are.