As defined by the W3C, "a software system designed to support interoperable machine-to-machine interaction over a network. It has an interface described in a machine-processible format (specifically WSDL). Other systems interact with the web service in a manner prescribed by its description using SOAP messages, typically conveyed using HTTP with an XML serialisation in conjunction with other Web-related standards."

For more information, see the Services page.

A service definition for a web service; a WSDL document.

The paths through a networked structure of tasks and activities; the steps in a business process