What is ULR ? Complete Definition of URl. How many part of URl?

URL

Definition: 
URL is the shortening of Uniform Resource Locator. URL is the worldwide location of archives and different assets on the World Wide Web. and is a reference (an address) to a resource on the Internet.

The first part of the URL is called a protocol identifier and it indicates what protocol to use, and the second part is called a resource name and it specifies the IP address or the domain name where the resource is located. The protocol identifier and the resource name are separated by a colon and two forward slashes.

A URL has two main components:

• Protocol identifier: For the URL http://example.com, the protocol identifier is http.
• Resource name: For the URL http://example.com, the resource name is example.com.

Host Name

The name of the machine on which the resource lives.

Filename

The pathname to the file on the machine.

Port Number

The port number to which to connect (typically optional).

Reference

A reference to a named anchor within a resource that usually identifies a specific location within a file (typically optional).