This document discusses J2EE (Java 2 Platform, Enterprise Edition), which is a Java platform for developing and running large-scale, multi-tiered, scalable, reliable, and secure network applications. It provides an architecture that simplifies development and maintenance of enterprise applications. Some key points made are: - J2EE aims to reduce server downtime, increase scalability, provide application stability, security and simplicity. - It allows "develop once, deploy anywhere" capability and supports n-tier architectures and component-based development. - J2EE applications are best suited for tasks like providing access to corporate databases, building dynamic web apps, automating communications, and implementing complex business logic.