Service-oriented architecture (SOA) is an architectural style that focuses on discrete services instead of a monolithic design.SOA is a good choice for system integration.By consequence, it is also applied in the field of software design where services are provided to the other components by application components, through a communication protocol over a network. A service is a discrete unit of functionality that can be accessed remotely and acted upon and updated independently, such as retrieving a credit card statement online. SOA is also intended to be independent of vendors, products and technologies.