Answer Posted / sivasubramanian.k

Enterprise Java Beans (EJB) is a managed, server-side
component architecture for modular construction of
enterprise applications.

The EJB specification is one of the several Java APIs in
the Java Platform, Enterprise Edition. EJB is a server-side
component that encapsulates the business logic of an
application.
Accordingly, the EJB specification details how an
application server provides:

Persistence
Transaction processing
Concurrency control
Events using Java Message Service
Naming and directory services (JNDI)
Security ( Java Cryptography Extension (JCE) and JAAS )
Deployment of software components in an application server
Remote procedure calls using RMI-IIOP.
Exposing business methods as Web Services.

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