Explorer window with the Filesystems tab displayed, showing the CDShopCart web module and its parts. Callouts identify the WEB-INF folder and its contents, which include the Classes folder, lib folder, and web.xml deployment descriptor file (shown without the .xml extension). The WEB-INF folder references all items in the module, per J2EE specifications. The Classes folder is used to contain all servlets, beans, and classes of the web module. The lib folder is used to contain tag libraries and imported JAR files. The web.xml file contains configuration items for the WAR file.