Enterprise JavaBeans
Enterprise JavaBeans (EJB) is a server-side component architecture for building scalable, transactional, and secure enterprise applications in Java. It provides a framework for developing distributed business logic, handling persistence, security, and concurrency, typically deployed on Java EE (now Jakarta EE) application servers. EJB simplifies complex enterprise development by abstracting low-level infrastructure concerns.
Developers should learn EJB when building large-scale, mission-critical enterprise applications that require robust transaction management, security, and scalability, such as banking systems, e-commerce platforms, or corporate resource planning tools. It is particularly useful in environments where integration with other Java EE technologies (like JPA or JMS) is needed, though modern alternatives like Spring Framework have reduced its dominance in many contexts.