URLs can make requests of host computers. For example, the URL http://www.altavista.com
is a request for
the computer named www in the domain altavista.com to run a program.
This type of URL is used for building interactive Web sites using CGI scripts and other programming techniques.
A uniform resource locator (abbreviated URL; also known as a web address) is a specific character string that constitutes a reference to a resource.
Most web browsers display the URL of a web page above the page in an address bar.
A URL implies the means to access an indicated resource, which is not true of every URI.
URLs occur most commonly to reference web pages (http), but can also have a role in
- file transfer (ftp),
- email (mailto),
- database access (JDBC),
- and many other applications (see URI scheme for a list).