<b>Service Oriented Architecture (SOA)</b>
A service-oriented architecture (SOA) is a collection of services that communicate with each other. Communication can involve either simple data passing or it can involve two or more services coordinating some activity. Some means of connecting services to each other is needed.
A service is a function that is well-defined, self-contained, and does not depend on the context or state of other services.
The communication is initiated by the a service consumer that sends a service request message to a service provider. The service provider returns a response message to the service consumer. The request and subsequent response connections are defined in a way that is understandable to both the service consumer and service provider. The connections are defined by Web services. A service provider can also be a service consumer.
<b>Enterprise Service Architecture (ESA)</b>
Enterprise Services Architecture (ESA) is SAPs open architecture for adaptive business solutions. ESA creates a gradual path to flexible, service-centric system landscapes and allows a non-disruptive transition of existing applications and architecture for more flexibility and value.
The fundamental premise of ESA is the abstraction of business activities or events, modelled as enterprise services, from the actual functionality of enterprise applications. Aggregating Web services into business-level enterprise services provides more meaningful building blocks for the task of automating enterprise-scale business scenarios. Enterprise services allow IT organizations to efficiently develop composite applications.
hope it was usefull..
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