Enterprise JavaBeans (EJB) is a server-side component architecture for developing distributed business applications in the Java programming language. It provides a standardized way to develop and deploy reusable, scalable, and secure business components, such as session beans, entity beans, and message-driven beans. EJBs are designed to run within a Java Enterprise Edition (Java EE) container and provide services such as transaction management, security, and persistence. EJBs make it easier to build enterprise applications by allowing developers to focus on writing business logic instead of worrying about infrastructure concerns.