"Plugins"
It should be noted that within the Apps Tab, both docker applications and plugins are available. Plugins generally extend the base OS to provide additional functionality, utilities etc. The policies of Community Applications are stricter on plugins than docker applications
This is because ALL plugins run as the "root" user. In other words, any plugin has complete access to any and all files stored on your server, along with having the ability to modify certain system files. In most cases, the ability to modify system files is required for the plugin to operate and provide the functionality it offers. Additionally certain plugins (notably unRaid DVB and unRaid nVidia) will completely overwrite the base OS boot files to provide their functionality.
Because of this, in certain circumstances when you are having trouble with your server you may be asked to reboot the server in "Safe Mode". This eliminates any possibility that the plugin(s) are causing the trouble. (The notable exception is unRaid DVB / unRaid nVidia which will require you to revert to the standard Limetech unRaid OS to eliminate them as a cause of the problem)
All versions of Community Applications clearly identify if the application in question is a plugin or a docker application (plugins will have "Plugin" within the category list, and will also have a plugin / docker watermark present on each of the application's cards)