: A 404 does not specify if the missing resource is gone temporarily or permanently; for permanent removals, servers should ideally use a 410 Gone status.
: A client-side error code (4xx class) signifying the server cannot locate a specific page or file. Code 404
By default, web servers provide a generic, plain text message like "Not Found". Custom 404 pages are recommended to maintain brand consistency and guide users back to functional areas of a site. 404 Not Found - HTTP - MDN Web Docs - Mozilla : A 404 does not specify if the
: Changing a URL slug for optimization without updating existing links. Implementation & Customization for permanent removals
: Redirection errors or server malfunctions.