Windows Web Services API(A native-code implementation of SOAP that provides a foundation for building Web services for internal Microsoft customers such as components of Windows and parts of Office)
Web service(A unit of application logic providing data and services to other applications that can invoke Web protocols); online service(When referring to Microsoft Volume Licensing Programs, a service provided over the Internet that volume licensing customers may subscribe to); Web-based service(A service provided via the World Wide Web)
Web services(Protocols that enable computers to work together by exchanging messages. Web services are based on the standard protocols of XML, SOAP and WSDL, which allow them to interoperate across platforms and programming languages, including the ability to manage federated identities and security)
PowerPivot Web service(A Web service that performs request redirection for processing requests that are directed to a PowerPivot Engine service instance that is outside the farm)
Exchange Web Services(A set of features that provides a programming interface for accessing Microsoft Exchange data through the Client Access server role by using Web services)
