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EJB- A brief Introuduction

Enterprise JavaBeans(EJB) is a platform for developing reusable and portable java applications. In very simple terms we can say that EJB is a java code that runs in a runtime environment called EJB container.
EJB has three different types of components Session beans, Message Driven Beans and Entity bean. Session beans and Message Driven Beans are used for developing the Business logic and Entity beans are used for persisitence.
EJB provides the following services transactions, persistence, State Management, Messaging, Security and many more. EJB can be considered as a framework because of the components and services they provide for Enterprise Application Development.

EJB2 Vs EJB3

EJB2