What are the adverse effects of website dead links on SEO optimization?

How does a website have a dead link?

Simply put, the dead link refers to the website link that was originally normal and could not be opened later. The server returns the 404 error page when the link is killed. There are several reasons for the emergence of dead links:
1. The database does not support dynamic links. If you set dynamic links, the links will become dead links.
2. When a file or page is moved, the online marketing link pointing to it becomes a dead link.
3. When the webpage content is updated and changed to another link, the original link becomes a dead link.
4. If the website creation is not completed, it will go to the server and there will be dead links.
5. When a folder name is modified, the path error link becomes a dead link.
6. Link writing errors will lead to dead links.
7. Website promotion server setting error
8. Modify the website structure.

So what is the impact on the website from the perspective of SEO optimization?

First, it is the user experience. Second, a large number of dead links will lead to Baidu's risk of downgrading, and K will be severely affected. Finally, the search engine does not rank well. The dead link is actually a url that cannot be opened. We can imagine the following: when a user opens a website promotion is a wrong link, the user will be disgusted, the bounce rate is low, so don't talk about the viscosity. The search engine's rating on the website will also be poor, and the online marketing search engine does not like to put a site with a dead link at the top, of course, this is not an absolute situation, is the majority. Therefore, when we check for dead links, we need to modify or delete them.
After the external link becomes a dead link, Baidu directly deletes the link. The reason why the external link becomes a dead link during Website promotion is generally because the website of the other party is revised, or the user ID is deleted, which makes the link unavailable. Or modify the template, move the Forum location, or the website is K. Generally, the chance of external links becoming dead links is much lower than that of internal links. After all, websites with external links are not always modified. As a webmaster, you must always check the internal links of the website and regularly clear dead links.