W3Schools.com

HTML Uniform Resource Locators

A URL is another word for a web address.

A URL can be composed of words, such as "w3schools.com", or an Internet Protocol (IP) address: 192.68.20.50. Most people enter the name of the website when surfing, because names are easier to remember than numbers.

URL - Uniform Resource Locator

When you click on a link in an HTML page, an underlying <a> tag points to an address on the world wide web.

A Uniform Resource Locator (URL) is used to address a document (or other data) on the world wide web.

A web address, like this: http://www.w3schools.com/html/default.asp follows these syntax rules:

scheme://host.domain:port/path/filename

Explanation:

  • scheme - defines the type of Internet service. The most common type is http
  • host - defines the domain host (the default host for http is www)
  • domain - defines the Internet domain name, like w3schools.com
  • :port - defines the port number at the host (the default port number for http is 80) 
  • path - defines a path at the server (If omitted, the document must be stored at the root directory of the web site)
  • filename - defines the name of a document/resource

Common URL Schemes

The table below lists some common schemes:

Scheme Short for.... Which pages will the scheme be used for...
http HyperText Transfer Protocol Common web pages starts with http://. Not encrypted
https Secure HyperText Transfer Protocol Secure web pages. All information exchanged are encrypted
ftp File Transfer Protocol For downloading or uploading files to a website. Useful for domain maintenance
file   A file on your computer


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