URL-> Uniform Resource Locator.
It is the address of a resource, which can be a specific webpage or a file, on the internet. It is also known as a web address when it is used with HTTP.
A URL can be entered manually by typing it in the address bar of your web browser. If the URL does not contain a valid server, a browser may display a "Server not found" error and if the path in the URL is incorrect, the browser may display a "404 error". A URL does not contain spaces and uses forward slashes to represent different directories. So, dashes and underscores are used to separate the words of a web address.
