System to System involves at least two computers that exchange data or interact with each other independent of human intervention or participation.

Uniform Resource Locator (URL) is the global address of documents and other resources on the World Wide Web. The first part of the address indicates what protocol to use (i.e. “http://”), and the second part specifies the IP address or the domain name where the resource is located (i.e. “www.usa.gov”).

Web services (sometimes called application services) are services (usually including some combination of programming and data, but possibly including human resources as well) that are made available from a business’s web server for Web users or other Web-connected programs.