What is the functionality of various tech stack

[akumar.oracle]

hi,
Can anyone explain me in brief what is the purpose of various components of Oracle Applications technology layer products?

Oracle Application DBA (AD)

Oracle Application Object Library (FND)

Oracle Common Modules (AK)

Oracle Application Utilities (AU)

Oracle Alert (ALR)

Oracle Workflow (WF)

Oracle Applications Framework (FWK)

Oracle XML Publisher (XML)

ta
Arvin