What is EJB3?

EJB 3 (Enterprise JavaBeans version 3) is a server-side, component-based, transactional, and secure Java EE specification that simplifies the development of enterprise applications. It allows developers to create reusable business logic components that can be deployed in an application server. EJB 3 promotes rapid application development by abstracting away many low-level details like transaction management, concurrency, and persistence, allowing developers to focus on the core business logic. It is commonly used for building scalable and robust enterprise applications, especially where distributed transactions and security are important.