A plugin is a collection of one or more features, or a third-party integration or tool that can be added to CloudBees CD/RO. Plugins are delivered as a JAR file containing the functional implementation. When a plugin is installed, the CloudBees CD/RO server extracts the JAR contents to disk into a configurable plugins directory. A plugin has an associated project that can contain procedures and properties required by the implementation. A plugin can provide one or more new pages for the web interface and may also provide a configuration page so you can provide additional information that may be necessary to implement the plugin.