A Web service is a method of communication between two electronic devices over World Wide Web. A web service is a software function provided at a network address over the web or the cloud; it is a service that is "always on"as in the concept of utility computing.

Web service
Web service
Web service
DAML-S: Web Service Description for the Semantic Web
DAML-S: Web Service Description for the Semantic Web
A Model for Web Service Discovery with QoS
QoS computation and policing in dynamic web service selection
QoS computation and policing in dynamic web service selection
Quality of service for workflows and web service processes
Web service semantics – WSDL-S
Model-based verification of Web service compositions
Custom operating system via a web-service
QoS-Aware Web Service Recommendation via Collaborative Filtering