When Google's robot (Googlebot) sees a "404 Not Found" message, it thinks the page it's looking for isn't there. Googlebot might check again later to see if the page is back, but if it keeps seeing 404, it gives up. It's a good idea to show a nice error page to users and search engines, so they know the page isn't available.
Smart Computers
Search engines are getting smarter with AI. They might not need as many backlinks if they can figure out what a page is about and how good it is without relying on links.
410 Gone
If Googlebot encounters a “410 Gone” message, it knows the page was intentionally taken down and won’t come back.
When Googlebot sees 410, it understands the page is gone for good and won’t keep trying to find it.
Some people think using 410 might make Google remove the page from its list faster compared to 404.
Other Things to Think About:
If a page says 404 or 410 but is still linked from other pages or listed in the website’s map, Googlebot might keep trying. To stop this, update the website map and remove any links to that page.
Google Search Console is a tool where website owners can tell Google not to look at specific pages temporarily.
Remember, how search engines work can change, so it’s smart to check Google’s own info to stay up-to-date.