A page that Google can't find !. yes that's correct and here is
How to Create a 404 Error Page in HTML
How To Fix Shopify 404 Page Not Found Error With Proper Redirects
404 Error Pages: The Ultimate Guide
Webmail gives error 404 - Mail - Hestia Control Panel - Discourse
404 Links Are Bad. Here's How To Fix Them In WordPress - GretaThemes
20,954 404 Page Images, Stock Photos, 3D objects, & Vectors
404 error page - Webflow University Documentation
The importance of a 404 page