What is "Error 404 Not Found"?

• "404 Error"
• "Page cannot be displayed"
• "Internet Explorer cannot display the webpage"
• "404: Not Found"
• "The page cannot be found"

What do all these messages mean? Why do some web pages result in these words appearing? Well I hate to say it, folks, but 404 errors are a fact of life on the World Wide Web. We just need to understand these messages and work around the possible problem. About.com explains 404 errors in this helpful tutorial...