Introduction To URL, What Is URL

The world wide web (web) is a network of information resources. The web relies on three mechanisms to make these resources readily available to the widest possible audience:

• A uniform naming scheme for locating resources on the web (URL).

• Protocols for accessing resources over the web (HTTP).

• Hypertext for easy navigation among the resources (HTML).

Eevey resourse available on the web (eg) HTML document, image, video clip, program, etc. has an address that may be encoded by Universal Resourse Identifier OR “URL”. URL’s typically consist of three pieces

• The naming scheme of mechaninsm used to access the resource.

• The name of machine hosting the resource.

• The name of the resource itself, given as a path .

Conside the URL that takes you to the HTML 4.0 Specification in World Wide Web

http://www.w3.org/TR/REC-html40/

This URL may be read as follows: There is a document available via the HTTP protocol, residing on the machine www.w3.org accessible via the path “/TR/REC-html40/”. Other Schemes you may see in HTML documents, Include “mailto” for email and “ftp” for FTP.

You may be familiar with the term “URL” and not the term “URL”. URLs are a subset of the more general URL naming scheme.