ESB - Enterprise Service Bus
An ESB is an integration platform in that applications that want to communicate with each other have to integrate. It also defines a backbone of your enterprise landscape so that applications and services can easily communicate.
SOA - Service Oriented Architecture
A SOA describes an architecture style in that software resources of an enterprise get accessible and discoverable on network as dedicated and defined services.
EAI - Enterprise Application Integration
An EAI is driven by business needs to achieve a certain business objective by connecting applications inside an enterprise and external partner systems. So it is a concept for integrating business functions with the help of a dedicated IT infrastructure along the value change. As they are provided by different applications and platforms by nature EAI deals with data and business process integration.
So what is the difference?
To make it short:
SOA is an architecture style based on services, EAI is a concept about connecting applications and services to new valuable services. Whereas the ESB is a concrete method for establishing an integration platform for inter-application communication.
Both SOA and EAI need in their concrete transformation components and the ESB plays an very important role for the realization.
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