Service virtualization is the ability to create a virtual service from one or more predefined Service files, typically defined in a Web Service Description Language (WSDL, pronounced Wizdel) file. Typically, service virtualization takes place across multiple back-end systems that expose their operations through WSDL documents. The services may be off-premise cloud computing Software as a Service(SaaS) artifacts or on-premise services deployed in the corporate Data center. An intermediary Cloud gateway sits between the producer and the consumer and aggregates the WSDLs. Based on policies enforced on the Cloud gateway, only authorized operations are exposed to the consumers.

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