W3C defines a "web service" as :
A software system designed to support interoperable machine-to-machine interaction over a network.
A Web service is a software application
- identified by a URI
- whose interfaces and binding are capable of being defined, described and discovered by XML artifacts
- supports direct interactions with other software applications
- using XML based messages
- via internet-based protocols
Main characteristics of Web services
- XML based everywhere
- Message-based
- Programming language independent
- Could be dynamically located
- Could be dynamically assembled or aggregated
- Accessed over the internet
- Loosely coupled
- Based on industry standards
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