_addonPluginDefinedNote

You may notice that the terms 'app', 'add-on' and 'plugin' all appear in the Atlassian documentation and tools. While the terms are often used interchangeably, there is a difference. A plugin is a type of app (formerly known as an add-on) that can be installed into an Atlassian host application. Plugins are what developers create with the Atlassian SDK.