This has to start with an unexpected discovery today. The company has several websites. There are links between each other and put them in friendly links. I just changed the link and wanted to check it. After using the webmaster tool, I found that I didn’t have my own! It turned out that I put my friend link in footer.hmtl. Then embed it into the home page through an iframe. In this way, the detected link is not the homepage, but the link to the footer page. The same is true for search engines. Search engines will look at the pages introduced by iframes and track the links inside, but they do not pay so much attention. And each individual iframe is also processed as a separate page. In fact, this can be discovered when viewing the source code of the page. You can only see the code of the iframe, but not the code of the page inside.
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