JBoss is a company specializing in middleware software. There are
numerous projects under the JBoss umbrella.
JBoss Application Server (JBoss AS) is one of the major projects.
how can i learn abt jboss clearly step by step.
If you want to learn about JBoss AS then download the latest stable version (5.1.0) start looking at its docs, forums, wiki (links are available on that project page).