A 404 Error is a page that is served up on a website when a visitor lands on a page that doesn’t exist. This either happens when they type in the wrong address, or the page they were looking for was deleted by the website owners. Perhaps it was temporary page – like an offer, or an article. Maybe it was a link to an image that was erased after it lost its charm. Regardless of the reason, the 404 is there to alert the visitor that while your website is still up and running, the page they are searching for is not.