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## 404 NOT FOUND! Sorry, the article you are looking for was not found!! The 404 page is an essential page for any website, carrying the important responsibilities of user experience and SEO optimization. A 404 page typically appears when a user accesses 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 appear, and when search engine spiders crawl such URLs, it is not conducive to search engine indexing. ## Origin of 404 Not Found It is said that before the Third Industrial Revolution, the internet existed in the form of a large central database located in room 404. At that time, all requests were completed manually by humans. If the requested file was not found in the database, or if the requester wrote the wrong file number, the user would receive a return message: room 404 : file not found. Later, when the internet became widespread, people simply got used to it.