You may see a web page with a 404 error while using the internet. Do you know why it appears? Let me explain. When you access a web link in the internet browser, instead of showing respective content from the website, you see an error page with a message like 404 Not Found, or the requested page is not available. When you type or copy-paste a URL into your web browser and hit enter to see the information, you actually send a request to the server situated somewhere in the world to show a pa...