Deployment is basically defined as the installation of the WAR files in the web application. In other words, we can define the unpacking of the WAR file in the Tomcat
You develop your web application within a specified directory structure so that it can be archived and deployed on Tomcat 7. All servlets, classes, static files, and other resources belonging to a web application are organized under a directory hierarchy. The root of this hierarchy defines the document root of your web application. All files under this root directory can be served to the client, except for files under the special directory
WEB-INF, located under the root directory. The name of your web application ...