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Javadeploy Glossary

Containers are the interface between a component and the low-level platform-specific functionality that supports the component.
Before a web component, enterprise bean, or application client component can be executed, it must be assembled into a J2EE module and deployed into its container. The assembly process involves specifying container settings for each component in the J2EE application and for the J2EE application itself. Container settings customize the underlying support provided by the J2EE server, including services such as security, transaction management, Java Naming and Directory Interface (JNDI) lookups, and remote connectivity. Here are some of the highlights:

The J2EE security model lets you configure a web component or enterprise bean so that system resources are accessed only by authorized users.
The J2EE transaction model lets you specify relationships among methods that make up a single transaction so that all methods in one transaction are treated as a single unit.
JNDI lookup services provide a unified interface to multiple naming and directory services in the enterprise so that application components can access naming and directory services.
The J2EE remote connectivity model manages low-level communications between clients and enterprise beans. After an enterprise bean is created, a client invokes methods on it as if it were in the same virtual machine.