What is the cost of Internet backward income to 25 yuan?

Advertising fees and bidding ranking fees. 25 yuan, the backward income of the Internet, is advertising release fee and bidding ranking fee. Advertising fee refers to the fee charged by Internet companies to enterprises or information providers to display advertisements on websites or platforms, including the rental fee and click fee of advertising space. Bidding ranking fee refers to the cost that enterprises or individuals buy keywords or specific search ranking positions on Internet platforms such as search engines to improve their website exposure and traffic. Therefore, the backward income of the Internet in 25 yuan is the advertising fee and the bidding ranking fee.