Is there a difference between Web services and Service Oriented Architecture (SOA)? If I have a Web service -- isn't that basically doing an SOA?
Service-Oriented Architecture is an IT business system design methodology that is focused on reusability, breaking down silos, and enabling rapid and on-going optimization of business processes. An SOA can be implemented using any number of technologies. However, in practice the Web services standards and technologies (XML, SOAP, WSDL, WS-Security, WS-Policy, etc.) are at the heart of forming every organization's SOA implementation.