It is the Internet address which tells a browser where to find a resource.
Most Large companies have a registered domain name with .
You can guess the URL by typing a company name in the location window and hitting enter. Be sure not to put a space between company names with multiple words. You can frequently find sites by typing a familiar name in the location bar and hitting the enter key. Truncating can also work when you get the file not found message. Try removing the last part of the URL, the file name, from the address in the location bar and hit enter.