Something called a Uniform Resource Locator (URL) is used to address a document (or other data) on the World Wide Web. A full Web address like this: http://www.paktutorial.com/html/ follows these syntax rules:
The scheme is defining the type of Internet service. The most common type is http.
The domain is defining the Internet domain name like academictutorials.com.
The host is defining the domain host. If omitted, the default host for http is www.
The :port is defining the port number at the host. The port number is normally omitted. The default port number for http is 80.
The path is defining a path (a sub directory) at the server. If the path is omitted, the resource (the document) must be located at the root directory of the Web site.
The filename is defining the name of a document. The default filename might be default.asp, or index.HTML or something else depending on the settings of the Web server.
Some examples of the most common schemes can be found below:
a file on your local PC
a file on an FTP server
a file on a World Wide Web Server
a file on a Gopher server
a Usenet newsgroup
a Telnet connection
a file on a WAIS server
Accessing a Newsgroup
The following HTML code:
<a href=”news:alt.HTML”>HTML Newsgroup</a>
creates a link to a newsgroup like this HTML Newsgroup. HTML Newsgroup
A URL is another word for a web address. A URL can be composed of words, such as “paktutorial.com”, or an Internet Protocol (IP) address: 18.104.22.168. Most people enter the name of the website when surfing, because names are easier to remember than numbers.
Common URL Schemes
The table below lists some common schemes:
Which pages will the scheme be used for…
HyperText Transfer Protocol
Common web pages starts with http://. Not encrypted
Secure HyperText Transfer Protocol
Secure web pages. All information exchanged are encrypted
File Transfer Protocol
For downloading or uploading files to a website. Useful for domain maintenance