You search for rice cookers on the e-commerce website, and big data will recommend advertisements for rice cookers with corresponding price according to your consumption portrait and consumption level. If the top few are below 3, you are basically regarded as suspension spring.

Open Taobao, directly search for the word rice cooker, and do nothing else, and see what the push results are in the front row.

The first four words include advertisements, which is the certification given to you by Taobao!

Have you ever had such an experience:

You bought a decorative mural on Taobao, and the next day you opened Taobao and found that the recommended products were all home improvement products; Or listen to a folk song on Netease cloud, and the next day Netease cloud pushed you several songs of the same type; Is it a coincidence, or is Taobao and Netease Cloud spying on your life? How do they do it? This is to ask the data engineers behind these softwares. Software such as Taobao will push the products that suit you best according to big data. But this is actually not evidence of your income.