The 404 error page is displayed when a client requests a page that is not present on the site. It indicates that either a link was wrong or the page was recently deleted. The 404 error is an HTTP standard response code meaning "Not Found" and shows that the server could not find the requested page, unlike a "Server Not Found" error where no connection was made. Web servers will generally issue a 404 HTML page with the code and phrase, but a custom 404 page can be designed and include a link back to the site.

1. Overview of 404 error page
The Error 404 "Page not found" is the error page
displayed whenever client asks for a page that is
not present on your site. The reason for 404 error is
that there may be a link on your site that was wrong or
the page might have been recently deleted from the
site. As there is no web page to display, the web server
sends a page that simply says "404 Page not found".

2. The 404 error message is an HTTP
(Hypertext Transfer Protocol) standard
status code. This "Not Found" response
code shows that if the client connected to
the server, but the server could not find the
clients requested for a web page.
The 404 "Not Found" error is not the same
as the "Server Not Found" error which you
see whenever a connection to the
destination server could not be established
at all.

3.  A 404 response code should be easily readable
phrase which can be easily understood by human
as per the HTTP specification. Generally, a web
server issues an HTML page that has the 404 code
and the “Not Found” phrase by default. But you
can also design your site’s 404 error page and
provide a hyperlink of your sites webpage which a
client easily returns to your website.

4. SOME EXAMPLE 404 ERROR PAGE DESIGN

6. EXPLANATION OF 404 CODE
 In code 404, the first digit “4” represents a client
error. The server indicates that you did a mistake
like misspelling the URL or requesting for a page
that is not available on your site.
 The middle digit, 0 represents a general syntax
error .The last digit, 4 refers to a specific error in
the group of 40x.

7. HTTP STATUS CODE
 Whenever you visit a web page, your computer will
request data from a server through HTTP. Even
before the requested page is displayed in your
browser, the web server will send the HTTP header
that has the status code. The status code provides
information about the status of the request. A
normal web page gets the HTTP status code as
200. But if the server could not find a web page on
your website then the server 404 HTTP status
code.
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