Add-ons
To extend the functionality of Tridion Sites with custom functionality, create or obtain one or more add-ons.
An Add-on takes the form of a ZIP file and the ZIP file contains one or more Extensions, which together represent your custom feature (or possibly multiple custom features). The package also contains a manifest file to explain where each Extension is located, and possibly custom configuration for the Extension.
The following diagram illustrates the structure and contents of an Add-on package: