A URL provides a general –purpose-naming scheme for specifying Internet resources using a string of printable ASCII characters. A typical URL consists of four parts:
  1.  The Protocol scheme tells the web browser which Internet protocol to use when accessing a resource on a server. In addition to HTTP, URL supports all major Internet protocols including FTP,Gopher etc. HTTP is the Web’s native protocol; it points to webpages and server programs.
  2.  The server name is usually an Internet host domain name that identifies the site on which the server is running.
  3.  The port Number identifies a program that runs on a particular server.You explicitly specify a port number after a server name using a colon(:) as the separator. If you do not specify a port number the browser will direct the well-known port HTTP. The port number is 80. 
  4. The path to target resources starts with the forward slash after the host and port number.
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