This was an issue since mostly all communication over the web had to be done via the HTTP protocol. SOA is a set of architectural concepts used for the development and integration of services. It has some specification which could be used across all applications. WSDL. A web service is a publicized package of functionality offered over the web. XML Short for Extensible Markup Language, a specification developed by the W3C . WSDL is an acronym for Web Services Description Language. Learn about how EWS works within the Exchange architecture, and find out which protocols EWS relies on. This type of service has two fundamental requirements: it communicates via Internet protocols (most commonly HTTP) it sends and receives data formatted as XML documents That's pretty much it. SOAP is a XML-based protocol for accessing web services. Typically, “HTTP” is the most commonly used protocol for communication. Web services are client and server applications that communicate over the World Wide Web’s (WWW) HyperText Transfer Protocol (HTTP). Web services are used to build applications that can send/receive messages using SOAP over HTTP. The WebServicesFaq points to several articles that contrast these two styles. First off, web services can take different forms. SOAP is XML based, so it is platform independent and language independent. The most widely accepted and successful type of service is the XML Web service (from hereon referred to as Web service or, simply, service). Both use HTTP as the transport protocol. Web APIs connect between applications and other services or platforms, such as social networks, games, databases and devices. A web service is a collection of open protocols and standards used for exchanging data between applications or systems. The data, and potentially the business rules, live on some other server on the network. For example, a power company may use an API to adjust the temperature on a thermostat to save power. Web service accomplishes the application's interactions and data communication among various applications by using a combination of open protocols and standards such as XML, SOAP, WSDL, and UDDI. The term Web service describes a standardized way of integrating Web-based applications using the XML, SOAP, WSDL and UDDI open standards over an Internet protocol backbone. SOAP is known as the Simple Object Access Protocol, but in later times was just shortened to SOAP v1.2. SOA vs Web Services . Additionally, Internet of Things (IoT) applications and devices use APIs to gather data, or even control other devices. SOAP is an XML-based protocol for accessing web services over HTTP. Whether you use a mobile application, search engine or an enterprise system, the user piece of the application (the interface) resides on your device. SOAP is a W3C recommendation for communication between applications. As described by the World Wide Web Consortium (W3C), web services provide a standard means of interoperating between software applications running on a variety of platforms and frameworks. Web Services are the means by which devices communicate over the World Wide Web. SOAP is a popular one, as is REST. Web service also uses SOAP, REST, and XML-RPC as a means of communication. REST Web Services : REST (Representational State Transfer) is a style of software architecture. The XML is an XML file used to tag the data, the SOAP stands for Simple Object Access Protocol. A web service is described by using a standard, formal XML notion that provides all necessary details like message format, transport protocols, and location to interact with the web service. In other words, it can be used with Java, .Net or PHP language on any platform. Web services can be used to implement SOA. 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