400: Bad Request and 404: Not Found error message in my Internet Browser. What does it means?

The 400: Bad Request error message. A common Error that can be appear in the Internet Explorer, FireFox, Chrome or any other Internet Browser. But what does it mean? Well if you get such a message than the link you want to follow, to receive the information your where looking for, seems not reachable. More technically: The 400 Bad Request browser error means that the request you was sending to Sharing is sexy