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