Uniform Resource Locator

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Most commonly used to find resources on the World Wide Web, but much more general in capability, a Uniform Resource Locator (URL). Their syntax is:


A URL contains the name of the scheme being used (<scheme>) followed by a colon and then a string (the <scheme-specific-part>) whose interpretation depends on the scheme. [1]

Representative schemes

Primary WWW usage

Most often, URLs use a scheme of http to refer to the Hypertext Transfer Protocol as the scheme, and a fully qualified Domain Name System (DNS) name as the locator.

This commonly refers to a link on the World Wide Web. URLs usually start with https://, e.g. this page's URL is https://citizendium.org/wiki/Uniform_Resource_Locator. In this example, the citizendium.org is a DNS name.

Direct IP protocol request



  1. Berners-Lee T, Masinter L, McCahill M (December 1994), Uniform Resource Locators (URL), RFC 1738