YouTip

## 404 NOT FOUND! Sorry, the article you requested was not found!! The 404 page is an essential page for any website, carrying the responsibility of user experience and SEO optimization. A 404 page usually appears when a user visits a page that does not exist or has been deleted on the website, and the server returns a 404 error. If the webmaster does not set up a 404 page, dead links will occur, which is unfavorable for search engine indexing when spiders crawl such URLs. ## Origin of 404 Not Found It is said that before the third technological revolution, the Internet existed in the form of a large central database, which was located in room 404. At that time, all requests were completed manually. If the requested information was not found in the database... ```