The 404 error pages occur when visitors attempt to access a file that does not exist anymore. There are several reasons for this error, being the most frecuent some of the following:

Broken link. There is no justification for this error. It must be corrected.

Pages that expire or are moved away. This error has no justification and must be identified and corrected.

When writing or copying a URL. This error may be kept under control offering simple and consistent URLs. It is also advisable to use small case always and avoid blanks in the file names.

eztools.com allows its users to define their own 404 error pages, enabling them to enjoy more personal web pages. Here you have a list of examples of customized 404 error pages.