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• Web services - are a type of internet software that use standardized messaging protocols and are made available from an application service provider's web server for a client or other web-based programs to use.
• XML - is used to tag, code and decode data. Xml-remote procedure call
• SOAP - protocol was developed to enable different programming languages to communicate quickly and with minimal effort using HTTP or simple mail transfer protocol (SMTP).
• WSDL - is used to tell the client application what's included in the web service and how to connect.
• REST - It is an architectural style that provides standards between computer systems on a web service.
• UDDI - Universal description, discovery and integration.
• Uses of web services -

  • Reusing code
  • Delivering services
  • Connecting existing programs
• examples of web services -

  google search

  google map

  Amazon
• Challenges of web service -

  • Complexity and compatibility
  • Security risks
  • Troubleshooting.
  • Vendor lock-in.