A 'Web service' is distinct by the W3C as "a software system designed to support interoperable machine-to-machine communication over a network". Web services are regularly just Web APIs that can be access over a network, such as the Internet, and execute on a remote system hosting the request services.
The W3C Web service definition encompass many different systems, but in ordinary usage the term refers to clients and servers that converse using XML messages that follow the SOAP standard. In such systems, there is often machine-readable report of the operations offered by the service written in the Web Services Description Language. The latter is not a obligation of a SOAP endpoint, but it is a prerequisite for automatic client-side code production in many Java and .NET SOAP frameworks. Some industry organization, such as the WS-I, mandate both SOAP and WSDL in their meaning of a Web service.
More recently, RESTful Web services have been retrieval popularity. These also meet the W3C meaning, and are often better included with HTTP than SOAP-based services. They do not require XML post or WSDL service-API definition.
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