Definition: The word '404.php' refers to a page that doesn't contain any content or data (specifically, a page with no HTML code or visible text). In technical terms, it indicates that there are no available resources or files on a particular domain or server where the web pages can be found. It's also sometimes used as an error message for servers that can't find a certain file or resource. For example, if you're using an online platform (like Google Maps) and the address bar doesn't display any results (e.g., '404 Not Found'), it could indicate that the map is not accessible in your web browser or that there's no actual data on your server.

/404.php

Definition: The `/wp-content/themes/sketch/404.php` is a PHP file that is included in WordPress themes when a page's content has gone wrong, such as a 404 error or an error with the theme itself. This file contains various messages to display to the user during their navigation on the site. The `/wp-content/themes/sketch/404.php` file typically displays different types of error messages based on what is causing the 404 page not found error: 1.

Internal Server Error:

If the theme does not have a proper error handler or if it's running in a production environment, this error message will be displayed. 2.

File Not Found:

This may occur when the theme has been updated but the files are still missing and cannot load them. 3.

404 Not Found:

A 404 Not Found error is usually caused by a file or directory not being found in the themes' path, which could be due to a typo in the URL of the page, a typo in the theme name, or a misunderstanding about how files are handled within the theme. The `/wp-content/themes/sketch/404.php` file can also include additional custom messages based on specific issues that may arise. For instance, if the theme is using an outdated version of PHP, it might display a more specific error message to inform users of what they need to do to upgrade the PHP. These messages could be displayed in different ways depending on how the user navigates through the site, such as by clicking on the "Go Back" button or using the backslash (`\\`) character, which can cause the file to be loaded and then processed again.

/wp-content/themes/sketch/404.php