Query string

A query string is an optional component of a URI, in the form of a string used to provide a set of one or more parameter values. When a URI is submitted to a server in a request to access, or otherwise interact with, a resource, the server may adapt its response in relation to those parameters.

For instance, parameters may further refine which resource is being targetted; may communicate the nature of intended interaction; may provide data to be utilised in certain forms of interaction (e.g. a new value); or may be used to assert authorisation for the request. Any content returned in response to a request may thus be altered in some way in response to parameters.

An address bar showing a URL with a two-parameter query string of title=Query_string&action=edit