A Web service is a collection of protocols and it is a standardized way of integrating web-based applications using some open standards SOAP, WSDL and UDDI .

These can be used for exchanging data between applications , these applications written in different languages and are running on various platforms. we can call it as “Interoperability”.

Basically, SOAP is used to transfer the data, WSDL is used for describing the services available and UDDI is used for listing the services available.