Web-based Service

AKA: Web-based Application.
Context:
- It can make use of a Web Service Interface, such as Web Service API.
- It can (typically) be supported by Web Server.
- It can be supported by Web Service Platform.
- It can range from being an Interactive Web-based System to being a Backend Web-based System.
Example(s):
- a Web Search Service.
- a Web-based Email Service.
- a News Aggregation Website.
- a Web-based Microtask Marketplace, such as Amazon's Mechanical Turk.
Counter-Example(s):
- a Package Delivery Service.
- a Desktop-based System.
- a Mobile-based System.
See: Internet Service, Online user.

References

http://en.wikipedia.org/wiki/Web_service
- QUOTE: A Web service is a method of communication between two electronic devices over the Web (Internet).
  The W3C defines a "Web service" as "a software system designed to support interoperable machine-to-machine interaction over a network”. It has an interface described in a machine-processable format (specifically Web Services Description Language, known by the acronym 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 serialization in conjunction with other Web-related standards."^[1]
  The W3C also states, “We can identify two major classes of Web services, REST-compliant Web services, in which the primary purpose of the service is to manipulate XML representations of Web resources using a uniform set of “stateless” operations; and arbitrary Web services, in which the service may expose an arbitrary set of operations."^[2]