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For a web application to be available, the context representing it must first be deployed to a host. In Tomcat, a context can be deployed as a WAR file or by copying the whole application to the webapps directory under the Tomcat installation directory. For each application you deploy, you can optionally have a descriptor file that contains the configuration settings for the context. A descriptor file takes the form of an XML document.
Note
Tomcat 4 and 5 come with two applications for managing Tomcat and applications deployed to it, the manager application and the admin application. The class files for both applications are in the %CATALINA_HOME%/server/webapps directory. Both applications come with descriptor files, which are manager.xml and admin.xml, respectively. In Tomcat 4, these descriptors reside in the %CATALINA_HOME%/webapps directory; in Tomcat 5 they live in the corresponding application directories, i.e. in the %CATALINA_HOME%/server/webapps/admin and %CATALINA_HOME%/server/webapps/manager, respectively.