You have probably heard the term URL, and when you've been surfing the web you use URLs to access HTML pages.
It's often easiest, although not entirely accurate, to think of a URL as the name of a file on the World Wide Web because most URLs refer to a file on some machine on the network. For the purposes of this document, we won't discuss the other uses.
A URL consists of two components, a protocol identifier and the resource name. For the URL http://example.com these are
http.example.com.Note: The inclusion of www before the resource name is (usually) optional. PSM is configured to direct any non-www requests to the www URL version. Forcing a site to use one or the other is preferred, otherwise, search engines tend to treat the availability of both as two sites.
A non-semantic URL is typically composed of a path, script name and query string. The query string parameters dictate the content to show on the page, and frequently include information opaque or irrelevant to users