Service Oriented Architecture (SOA) is an architecture approach to have software resources in an enterprise available and discoverable by defined services within distributed systems architecture. Each service has a predefined business objective and perform discrete units of work. The services are independent and do not depend on the context or state of the other services.
Enterprise Service Bus (ESB) is a middleware infrastructure component to facilitate the implementation of the SOA approach. ESB is a messaging backbone that performs tasks such as protocol conversion, message format transformation, routing, logging, and accept and deliver messages from various services and application that linked to the ESB.
Enterprise Application Integration (EAI) allows diverse applications in an enterprise including partner systems to communicate to each other to achieve a business objective in a seamless reliable fashion irrespective of platform and geographical location of these applications.
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