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