Web service was too general to fulfill technology's main purpose,interoperability. The main purpose of webservices technologies is to allow applications on different platforms to exchange business data.There are two major factors to use web services,both remarkably straightforward that someone else has information that you require, or you have information you wish to provide to others.
Web service technologies are used for Application to application(A2A) integration or Business to Business communication.A2A refers to disparate applications within single organization communicating and exchanging data-A2A is also known as Enterprise Application Integration(EAI).B2B refers to multiple Organizations,typically business partners,exchanging data.Web service technologies today are mostly used in A2A/EAI settings.But they are also in B2B.
Another major use of web services is it can provide any level of security, from a completely open service open to all who request it,to a private service with transfers happening over SSL and client-side certificates to validate identities.
Also Web services make use of technology that is existing in already deployed Webserver,database and others.
Web services can help manage costs and easy integration with businesses.
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