Custom 404 Page
Checks if the website has a custom 404 error page.
What is this check?
A 404 'Not Found' error occurs when a user tries to access a page that doesn't exist. A custom 404 page is a user-friendly page you create to be shown in this situation, instead of the browser's ugly default error.
Why is it important?
A good custom 404 page improves user experience. It acknowledges the error, keeps the user on your site, and provides helpful links (like a search bar or a link to the homepage) to help them find what they were looking for.
What is the impact?
A generic 404 error is a dead end that often causes users to leave your site. A custom page can help retain that visitor.