In tomcat / webapps, Tomcat own directory containing 5:
docs
Tomcat introduction and operation documents, and so
examples
program example
host-manager
about the host management
Manager
Server Status and management of applications
on server and other applications to start, restart, shut down other operations
related to Session, JVM performance parameters, monitor operation and management
ROOT
root directory, access localhost: 8080 / path / below the relevant WEB universal access configuration and other
docs, examples and ROOT these folders can be deleted directly. While other host-manager and manager can not be deleted, if you delete these folders, you need to modify the configuration part of the file, otherwise it will throw an exception when the log output.