Terms you'll need to understand:
Web archive file
Web app deployment descriptor
Techniques you'll need to master:
Identify the structure of a Web application and Web archive file.
Name the Web app deployment descriptor.
Name the directories where you place Web resources.
Name and describe deployment descriptor elements.
Configure the deployment descriptor to handle exceptions and errors.
Configure Web applications for security.
Configure servlets and listeners through the deployment descriptor.
A Web application is a collection of server-side resources, including servlets, JSP pages, ...