What is a Web service?

Definition:

A Web service is 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 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.

  • Web Services can convert your applications into Web-applications.
  • Web Services are published, found, and used through the Web.

What are Web Services?

  • Web services are application components
  • Web services communicate using open protocols
  • Web services are self-contained and self-describing
  • Web services can be discovered using UDDI
  • Web services can be used by other applications
  • XML is the basis for Web services

Web Services have three basic platform elements: SOAP, WSDL and UDDI.

1.SOAP (Simple Object Access Protocol)

SOAP is a protocol for accessing a Web Service. SOAP provides a standard, extensible, composable framework for packaging and exchanging XML messages.

  • SOAP stands for Simple Object Access Protocol
  • SOAP is a communication protocol
  • SOAP is a format for sending messages
  • SOAP is designed to communicate via Internet
  • SOAP is platform independent
  • SOAP is language independent
  • SOAP is based on XML
  • SOAP is simple and extensible
  • SOAP allows you to get around firewalls
  • SOAP is a W3C standard

2. WSDL (Web Services Description Language ).

WSDL is an XML-based language for locating and describing Web services.WSDL describes Web services starting with the messages that are exchanged between the requester and provider agents. The messages themselves are described abstractly and then bound to a concrete network protocol and message format.

  • WSDL stands for Web Services Description Language
  • WSDL is based on XML
  • WSDL is used to describe Web services
  • WSDL is used to locate Web services
  • WSDL is a W3C standard

3. UDDI (Universal Description Discovery and Integration)

UDDI is a directory service where companies can register and search for Web services. UDDIis a platform-independent, Extensible Markup Language (XML)-based registry for businesses worldwide to list themselves on the Internet and a mechanism to register and locate web service applications.

  • UDDI stands for Universal Description, Discovery and Integration
  • UDDI is a directory for storing information about web services
  • UDDI is a directory of web service interfaces described by WSDL
  • UDDI communicates via SOAP
  • UDDI is built into the Microsoft .NET platform

Learn ASP.NET Web Services  from MSDN >>

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