What it is
A 404 error is what a browser shows when someone requests a page that doesn't exist on your server — either because the URL was mistyped, the page was deleted, or a link pointing to your site is broken. "404 Not Found" is the technical response code your server sends back.
Why it matters
404s are dead ends. A visitor hits one and they're done — they either go back or they leave. Too many 404s also signal to Google that your site isn't well-maintained, which can affect how much of your site gets crawled and indexed.
The mistake most people make
Having a generic, unhelpful 404 page. If someone lands on a 404, you've already lost them a little — but a good 404 page with a search bar, popular links, and a human message can recover some of them. A white page that just says "404 Not Found" recovers nobody.
Want help with this?
Knowing what 404 Error means is useful. Having someone implement it correctly for your business is better. Let's have a real conversation — no pitch, no menu.