Ten or 15 years ago, when people talked about Web Services, you would immediately understand they were referring to SOAP. But these days, if someone says they have a Web Service interface, you need to follow up with the question: “What kind of Web Service – SOAP or REST? ” In fact, REST is fast becoming the more visible application interface on the Internet. This blog provides a quick overview of what REST is, and how it compares to SOAP.
Firstly, like SOAP, REST is a Web Service, which by definition provides an Application-to-Application interface. So functionally, REST is similar to SOAP in that it enables a Client application to invoke an operation/method in a Server application . Furthermore, REST uses HTTP and HTTPS as the communication protocol, just as SOAP does. Their differences lie in what is underneath the cover.