The document provides an overview of JBoss Application Server, including its definition, architecture, advantages, installation, configuration, deployment, running applications, and undeployment. It discusses that JBoss is a widely used open source Java application server that allows deployment of Java applications and provides services like transaction processing and security. The document also provides details on installing JBoss, using the management console, deploying applications as WAR files using Ant build scripts, and modifying or removing deployed applications.