What are Enterprise JavaBeans?

EJB is a major part of the J2EE specification and defines a model for building server-side, reusable components. There are three types of enterprise beans currently supported by J2EE - session beans, entity beans and message-driven beans.
Session beans can be seen as extensions to the client application and are typically used to model business processes. There are two types of session bean - stateful and stateless. Stateful session beans are typically used to record conversational state for a single client between requests, whereas stateless session beans are shared between any number of clients at any one time.
Entity beans are typically used to model persistent business entities and, in particular, data in a database. A common mapping is to model an entity bean on a table, there being one instance of that bean for every row in the table. There are two ways that persistence can be achieved - container managed and bean managed persistence. In container managed persistence, a mapping is defined at deployment time between the persistent properties in the bean and the columns in the table. With bean managed persistence, developers write the JDBC code that performs the create, read, update and delete operations.

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